I made a life size Billy puppet from Saw for my best friend's annual Halloween bash/haunted house/birthday party. I built the body from dowels hinged with eye hooks and wrapped in memory foam, sculpted the head using mend-it and milliput on a doll's head with the hair cut to match, and topped it off with a kid's size ninja costume. The puppet is attached to the bike (we didn't have a tricycle, but the bike looks right anyway) and it actually looks like it's pedaling and steering the bike when you push it, and the head moves back and forth slightly, it pretty creepy. Hope to get some good scares with this one.