I started experimenting with the 123D Sculpt on my iPad Mini recently. One feature that I really like is the ability to give the sculpture a “skin” using artwork from your photo albums. In this picture I used an Inkpad/Retromatic portrait mashup and applied it directly to the head and owl sculptures. I took a photo of the two sculptures with an invisible background. I imported those two images into Sketchbook Pro using the layers feature. I also imported Hipstamatic iphotos of the rose, the two head vases and the magnetic poem. I used the erasure tool to cut out the various collage elements. The great thing about the layers feature in Sketchbook Pro us that you can move layers around and vary their transparency.
A screenshot of Sketchbook Pro with the layers open
Photo of head sculpture with transparent background
Owl sculpture with transparent background
Inkpad and Retromatic portrait
Apps used in collage: Inkpad, Retromatic, Hipstamatic, 123D Sculpt and Sketchbook Pro