I just did one but I used the plastic figures. I made the rainbow out of gumpast. I colored the gumpaste, rolled out each color, and cut out a strip. Layed each strip next to each other, wet the seams and then layed it on the former to dry. It was dry the next day but I made it 2 days ahead of time.
Here is the link to my version: https://www.facebook.com/#!/photo.php?fbid=10150660598021345&set=a.10150648745296345.379367.77380431344&type=3&theater
Barbara, CustomCakesbyBarbara.com
