LEGO Birthday Cake

I made Oliver & Jo's LEGO birthday cake! I'd seen a few cakes like these online, but couldn't find any tutorials on how to make them. I did my best, but I wish I'd taken the time at the beginning to cut the sides of the cake to be completely straight. The final product looks a little bumpy. Live and learn, right?

I started work on the bricks a few days before I baked the cake. I bought silicon LEGO block molds that were fairly inexpensive on Amazon (3 for $7.75). I also bought fondant this year instead of making my own. I used an online coupon from Michael's and bought fondant for $5.

I used a melon baller to help measure to make sure my blocks were all about the same size. The first set of fondant LEGO blocks got stuck in the mold. I dusted in the inside with powdered sugar, and that fixed the problem. The rest came out without any problems.

My final supply list:
Fondant pack of green, red, yellow, and blue
White fondant
Powdered sugar (to dust the inside of the molds)
Silicone LEGO block molds
2 boxes of cake (and the ingredients needed to make the cake--eggs, oil, etc)
1 can of frosting (for the crumb layer)
Black gel frosting for the lettering
LEGO figures to decorate the cake

I didn't want to use the blocks up the size of the cake. Instead, I just cut out rectangles from rolled fondant to look like the sizes of the LEGO blocks. I kept all of the fondant pieces in the fridge so they wouldn't lose their shape. 

Two nights before the party, I baked the cake. I used two boxes of cake mix, and I made two 13x9 inch cakes. The next day, I frosted and stacked them as a crumb layer. That afternoon, I covered the cake in a very thin layer of white fondant. It will save you a lot of trouble later if you make sure all of the sides are as flat as possible! I dampened one size of the rectangles (water helps the fondant stick), and I built up the walls in a LEGO brick pattern. You can see my progress here:

When I finished, I added some strips of rolled white fondant and made it look like Emmett was unrolling it onto the cake. I stuck fondant on the bottom of the LEGO figures to get them to stick to the cake.

To make the lettering, I just printed a picture of "Happy Birthday" in LEGO font. I set it over the fondant and cut out the red. Then I set it over the fondant and cut out the yellow, and then I set it over the fondant and cut out the white. I stacked them, and then outlined the white lettering in frosting. I made a makeshift frosting bag out of fondant for Good Cop to hold to try to make it look like he was writing "Happy Birthday."

I found the candy letters at the grocery store. I wanted to give each of the LEGO Movie characters a job, so Benny got the letter R to look like he was spelling out the names.

When the fondant was still soft, I stuck Wyldstyle's arms in the block. I refrigerated her and the block until it was hard, and then I added them to the cake.

Larry the barista is helping make the cake, too!

There's the finished cake! I'd added the white frosting shells to the top to conceal the spot where the sides met the top. I didn't like how it turned out, so I covered it up ;-) I finished the evening before the party and then kept it in the fridge so the fondant wouldn't get too soft and start to droop.

It took a lot of planning and work. I really wish I'd spent more time getting the sides straight, but I still love the cake. It's a lot of fun!