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Easy Recipes for Everyone

DIY Lego Cake

Published August 20, 2014 by Jennifer / 4,439 Comments.
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If you are a follower on my Instagram page, you have probably seen quite a few pictures of this LEGO cake! I had such a fun time making this for a little one’s birthday party. Cute and fun, they will all love this diy LEGO block cake.

DIY Lego Block Cake via PinkWhen.com

DIY Lego Cake

Having a little guy in the house turn six years old, and a LOVER of Legos had me thinking that I needed to make him a Lego cake. I immediately ran over to Pinterest. It was a fun search, but there was nothing that really hit what I was wanting to create. I decided to take some bits and pieces from different cake ideas and with the help of my mom, we came up with this fabulous DIY Lego Cake.

DIY Lego Cake via PinkWhen.com

If you are a follower on my Instagram page, you have probably seen quite a few pictures of this LEGO cake!

DIY LEGO Cake

Having a little guy in the house turn six years old, and a LOVER of Legos had me thinking that I needed to make him a Lego cake. I immediately ran over to Pinterest. It was a fun search, but there was nothing that really hit what I was wanting to create. I decided to take some bits and pieces from different cake ideas and with the help of my mom, we came up with this fabulous DIY Lego Cake.

DIY Lego block cake via PinkWhen.com | crafts | recipes | diy

image 7514575 10273743

After we had our cake pan set, we set out to make the cake. Here is what you will need on hand before starting:

DIY Lego Cake

  • 3 white cake mixes (and ingredients needed for those)
  • Wilton 9 x 2 Checkerboard Cake Pan Set
  • food coloring in red, greed, and blue (we used the paste)
  • Wilton Spray & Seal
  • a good buttercream frosting
  • fondant (Yellow, Red, Green, and Blue)
  • A few Legos (little people and blocks)

Making your LEGO Cake

Make your three cake mixes and place them in separate bowls. Add your color paste a little at a time until you get the color you are looking for. I wanted bright Lego colors, so my batter is awfully bright! (In fact, the green really reminded me of the Nickelodeon Slime!

Lego Cake batter

I found the best thing to do was to make the cake the day before you do the icing. It will make things a lot easier. I created a diagram below of how I made these cakes once the cake batter was made and the dye paste was added.

Lego Cake Batter Pouring

 

Once the cakes were allowed to cool, I took a serrated knife and cut rounded portion of the tops off. I wanted my cakes to be able to be as straight as possible for the finished product.

Since you are using a  buttercream frosting before placing on the fondant, you will end up picking up crumbs from the cake. I have found that the Wilton Spray and Seal is perfect to keep those crumbs at bay and help make frosting a cake easier.

Making the LEGO Cake

Once our cake was covered with buttercream frosting, it was time to add on the fondant and make the cake!

I used a ruler to determine the height of my cake. I then rolled, measured, and cut a strip of yellow fondant to cover the sides of the cake.

Now here comes the fun part! Making all of those little Lego blocks for the cake. Just simply roll the different colors of fondant and then using an actual LEGO block (like a cookie cutter) I stamped the Legos into the fondant. I then used a small knife to finish cutting around the edges and set the blocks aside.

Once I had all of the blocks created, I just simply started laying them out in a pattern on the top of the cake and stuck with that same pattern all the way on top.

Lego Cake Start

Once I was finished with the top, I add a little blue border on the bottom. I filled in any extra areas on the top, and then added a few Lego blocks of fondant around the sides of the cake.

DIY Lego Cake

I found that the construction guy was the best fit for the top of this cake, because it was indeed a construction project!

DIY Lego Cake

Sorry I don’t have the normal step by step pictures, but I was honestly not going to make this a post until a lot of friends and family suggested I should share the steps. Just in case anyone else wanted to try their hand at making one.

DIY Lego Cake via PinkWhen.com

DIY Lego Cake

What do you think? I think it turned out good for my first time using fondant and decorating a cake!

DIY Lego block cake via PinkWhen.com | crafts | recipes | diy

I hope you enjoyed this DIY Lego Cake post, and if you make one, tag me in a picture on Instagram or Facebook, and leave any questions you might have here.

DIY Lego Block Cake via PinkWhen.com

You might also like this easy DIY S’mores cake!

Smores Cake Recipe @PinkWhen 12

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Jennifer
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August 20, 2014 · 4,439 Comments

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Reader Interactions

Comments

  1. Tamara says

    August 20, 2014 at 16:38

    I did see it on Instagram and I was SO impressed! I love the details and your diagrams.
    No doubt, this is a talented cake.
    I’m sure the birthday boy LOVED it.

    Reply
    • Jennifer says

      August 21, 2014 at 07:09

      Thanks Tamara!

      Reply
  2. Angel says

    August 21, 2014 at 16:48

    This is so awesome! My son would absolutely love it. I wish I could make it look as great as yours.
    Angel

    Reply
  3. Trish says

    August 21, 2014 at 21:54

    This is just adorable. My grandson turns 4 on Monday…I will ask his mom about making this for him. Thanks for sharing this.

    Reply
  4. Brita Long says

    August 25, 2014 at 07:55

    This is amazing. My husband loves legos. Our wedding cake topper was a lego bride and groom. 🙂 I might see if he wants to make a lego cake together for his birthday!

    Reply
  5. Ashley @ 3 Little Greenwoods says

    August 25, 2014 at 09:56

    I love a fun party and this cake looks AWESOME!

    Wonderful job on this tutorial. Please share this tutorial at my Show-Licious Craft & Recipe Party!
    ~ Ashley

    Reply
  6. Elise @frugalfarmwife.com says

    August 25, 2014 at 14:25

    So cute! I’m impressed with your patience with the lego “bricking”. 🙂

    Reply
    • Jennifer says

      August 25, 2014 at 18:12

      Honestly…I was impressed with my patience also! It took the longest.

      Reply
  7. T'onna @ USS Crafty says

    August 26, 2014 at 09:51

    Cute Lego cake!

    Reply
  8. Layne says

    August 28, 2014 at 08:41

    My boys would LOVE this cake!

    Reply
  9. Nechelle says

    August 29, 2014 at 17:23

    Looks very creative. ..delicious too

    Reply
  10. BIJAL says

    May 5, 2020 at 10:14

    Hi,
    i really like your idea of a Lego cake. my son’s birthday is the end of this month and I am planning to attempt a lego cake as per your recipe. I am still a beginner in a baking aisle. i have a few questions on the cake and I was hoping if you can please help me with that.

    1. do you think I can just use colored frosting instead of fondant all together? my family is not a fan of fondant. so I was thinking to use a mold to get lego shapes with frosting and freeze them. i know it is more work, but do you think it will hold the shape and stick on the cake?
    2. also, in your recipe, how much frosting sand how much fondant did you need? like weight? i need to order things and want to get an idea.
    TIA..

    Reply
    • Jennifer says

      May 6, 2020 at 06:49

      I am not sure how well frosting will hold up versus using fondant. You could definitely give it a try! As far as how much you would need, I purchased the pre-colored packages of fondant. You can find it in the baking section of the craft stores and in some grocery stores. I only purchased a small tub of each color fondant I wanted to use. I don’t have the weight of the frosting I used, but it was about a cup of frosting we used to hold the fondant pieces in place.
      I hope that helps!

      Reply

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