My son requested a Wall-E cake for his 6th birthday. It took some creativity, but turned out to be not very difficult.
I stacked 3 8″ x 8″ cakes (with frosting in between) on top of each other for the body. My cakes turned out a bit flat, so I probably should have used 4 cakes for a more square body.
The neck is a paper towel roll covered in frosting. The head is a foam block that I carved and frosted. For the tracks, I cut an 8″ x 8″ cake diagonally and trimmed the corners a bit to give them a slightly rounded look. The arms were tricky. I ended up taping two spatulas to foam triangles, then taping the foam to the cake board.
The body is frosted in yellow, with some rust-colored patches blended in. The top, neck, and head are frosted in gray. The tracks are frosted in brown.
The eyes are Oreo wafers, as well as the cogs on the tracks. The tracks are pieces of black licorice. I sprinkled crushed Oreos around the bottom to look like dirt.