Create your own one-of-a-kind product with Zazzle!
This shop is fantastic. You can take any image, a drawing, photo, or computer creation, and put it on just about anything! They have iPhone cover, T-shirts, ties, cups, bags hats, stamps, stationary, ornaments, mouse pads, skateboards...the list is practically endless. They also sell their own creations, with popular themes. Right now they have a huge selection of Harry Potter and the Deathly Hallow themes items.
It runs a bit pricey, as it is a custom order shop, but not too steep. Head over to zazzle to start your own creations.