T-Shirt War is a pretty cool stop motion animation done by changing T-Shirts. Check out the site where you can order some T-Shirts worn in the video, or you can just order replicas. Looks like they must have done a roaring business because the video’s been watched over 1.5M times. Love that they have the before and after graphics, very cool stuff.
This is also probably one of the best examples of using Youtube to merchandise something, and a great example of the collaboration between youtubers to create something unique and I expect quite profitable.