Idea: Photo pop outs

It's one thing to take great photographs, but it's easy to do some extra things to create extra value.
This idea (from Photojojo) involves creating novelty pop-up photographs with your shots.
Essentially you give your photograph a 3D effect using two copies of the same photograph, foam core, tape and a knife.
Obviously some photographs are going to be better for this than others. Photos with animals, people, children, action shots can work well. Experiment then branch out!
Selling:
This kind of product can be posted to buyers.
Perhaps your customers can submit their own photos for you to doctor. They could email a high-quality digital photograph, which you can print, for example ...

Here is the tutorial on Photojojo