This rainbow cake was made for a cake competition and won three out of the four categories; Best Taste, Best in Show, & Most Creative.

There are six layers of cake inside: red, orange, yellow, green, blue, and purple.  They are thinner layers, about a third the size of a regular cake layer.  The cake is filled and frosted with almond buttercream.

I used marshmallow fondant to cover the cake and sponge painted it with food dye.  Instead of using water as a base to thin the food dye I used vodka because the alcohol dries faster than water and keeps the fondant from becoming too sticky.

I used three different sized star cutters to cut out yellow fondant to embellish the cake.  Wire supports were shaped by wrapping it around a marker.  Any cylindrical object would work for this, I just happened to have a marker nearby.