For a cool desk toy that utilizes the power of the sun, get the Jack Skellington Solar Powered Bobble Head.
Recognizable from the cult classic A Nightmare Before Christmas Halloween movie, Jack Skellington is a bit more pudgy here than what I recall of his skeletal figure in the flick. However, he is super jolly, with his creepy grin as he harnesses the power of the sun while he chills on his little ice floe. This bobble head needs no movement to get started, it just starts nodding its head as soon as the light hits it, giving you a playful way to decorate your desk.
The Jack Skellington Solar Powered Bobble Head is fun in the sun.