Hi there!
I just finished my latest Arduino powered project- an animatronic Stargate Horus helmet. The helmet is constructed of cardstock, paper mache and foam sheet with some thin plywood for the head mech and fan parts. I made up a small servo controller board based on the Sparkfun ProMini. There is a complete build tutorial and video here- http://www.instructables.com/id/Animatronic-Stargate-helmet/
Here's what the finished helmet looks like-