For the snail I went with a natural color scheme. I wanted my snail to have a realistic tone, rather than a wild and colorful scheme.
When I put it together I made sure that the bottom stayed open. I attached my snail to a small robot I made out of a hand brush, a vibrating motor, and a housing for batteries with a switch from a small toy.
When I flip the switch the vibrations make the bristles move back and forth, thus pushing the snail around.