The Princess Bubblegum Crown, $30 from Etsy's Carry The What, is a pretty sweet fashion accessory for the Adventure Time fan who's got everything. You can download and print your own, if you've got a 3D printer.

http://feeds.boingboing.net/~r/boingboing/iBag/~3/GtvL66xv_Wg/3d-printed-princess-bubblegum.html