LEGO Brick Cake

I made three LEGO brick cakes for my sons' birthday party.  They turned out really great.

Ingredients:

2 cake mixes (I used Betty Crocker yellow cake)
2-3 whipped vanilla frosting containers
large marshmallows (snip off 1/4 of the bottom with scissors)
food coloring

Make cake according to directions in 3-4 8X8 size pans.
Let cool and freeze for a few hours or overnight to make it easier to frost smoothly.
Tint frosting in a bowl.
Frost all sides of the cake.
Put the marshmallow on a fork and frost completely all sides and top.
Place on cake in the spot where a peg would go.