Here's a little holiday "freeware" treat for Mac users called SantaSnaps, created by iClip developer John Casasanta for the Cocoa Duel charity programming competition, with graphics and program icon created by Adam Betts.
SantaSnaps a Photo Booth clone with a holiday twist, and works with your external iSight camera if you don't have one of the new Intel Macs with the built-in iSight. Launch SantaSnaps, select a Santa beard, glasses, and hat, then position yourself behind the props. (Requires OS 10.3 or higher). Cheers!