This was my first cake for a non-family member. The bottom cake is a plain vanilla sheet cake sprayed with blue and dusted with glitter. For R2D2, I used a tombstone-shaped "Over the Hill" cake pan. Then I outlined the details for R2D2 with black gel. All buttercream frosting...I smoothed the frosting on R2's head, and painted it with silver and moonstone luster dust. I used a picture of R2D2 as a reference, since the details on most of the cake instructions aren't as accurate. And kids will notice :)