Is that not the coolest thing ever? I thought so too. So the other day my friend Gabby and I made it! We weren't really sure how it was going to work, because we only had a series of pictures to go off of, but it turned out great! It's super easy; you should make one!
First you need two white cake mixes. We used a whole cake mix for the dots, but we ended up with too many dots to fit in the pan and not enough white cake to cover them, so I would use about 2/3 of a cake mix for the dots. Separate your cake mix into bowls and color them. We used 5 colors: purple, green, blue, pink, and orange, but you can use however many you'd like. The pictures showed using a cake pop maker to make the dots, but I don't have one. We used a mini cupcake pan instead and it worked just fine! Bake your mini cupcakes (or cake pops) at 350 for 10 minutes. You want them to be firm enough to move, but not completely done otherwise they will be dry when you bake the whole cake.
You can freeze them after they come out, but it's not necessary. We didn't freeze ours and it was just fine.
After that you place them in the pan with the rest of the mix. Pour a small amount of cake mix in the bottom of two circle pans (mine are 9", but you can use whatever you have), just enough to cover the bottom. Place your dots on top and arrange them however your heart desires. Pour the rest of your cake mix on top. If you don't have enough it's not a big deal, the cake will rise.
Bake the cake at 350 for 15 minutes and check it. If it's not done bake 2-3 minutes at a time, checking it at each interval. When it's done it'll probably look like this.
Now you can decorate! Let the cake cool for about 15 minutes and then you can flip it out. I just made a basic white icing (one bag of powdered sugar, 2-4 T milk, 1/4 C crisco) and spread that on the sides and in between the layers. Then I used another Pinterest idea for the top. The idea was to use cookie cutters as stencils and put sprinkles inside the cookie cutters. It worked like a charm, with a little spillage. However, I wouldn't suggest trying to fix the spills by blowing the sprinkles off, because you'll end up blowing the other sprinkles all over the cake...
Finished product!
Enjoy!