Spread a layer of mixed paint onto the top of a makeup sponge like icing. By squeezing some white paint onto the paper plate and mix with a little bit of pink paint to color the “icing"
Put a matching makeup sponge on top, and spread more paint mixture on the top and side.
Stick miniature pom poms into the icing as a fancy trim. You can also add glitter on top of this for even more decoration.
Repeat on the other makeup sponges, using different colors and details. Let it dry completely.
Thread the needle and pierce one of the top corners of the cake slice. Tie the thread into a loop and attach onto backpack Zip and use as a keychain.