place stick of butter into mixing bowl with paddle attachment and whip until light and fluffy, about 2-3 minutes scraping down half way through.
add cup of powdered sugar, pinch of salt and vanilla and whip until well combined and fluffy. Seperate into seperate bowls to add colors.
Add desired colors and mix well, set aside.
Place one of the cakes on a cake board, or plate. Use a little frosting as glue so the cake will not move. Frost and stack.
Once coated place in freezer or fridge to set up.
Using colored icing, I piped out "carrots" onto wax paper and froze them for 15 minutes.
Once they are frozen, you can pop them off and use to decorate your cake
Have fun with it!