Delightful in its simplicity, Cincinnati designer Kyle A Koch's iPhone document-shooting rig cost pennies to build and could be easily modified to hold any similar device.
When I got my iPhone last year I loved having everything important in one place, and the ability to get rid of unneccesary devices, documents and information i kept with me. I would frequently snap photos of class assignments printed on copy paper so I wouldn’t have to worry about losing them. The documents normally came out pretty clear, but it was tough to keep still while taking the pictures. I set out to make something that would ensure clean, consistent pictures of documents taken with the iPhone that would be free and easy to make on your own. And so, here you will find pictures of and a link to a template to make your own iPhone document scanner.
The patterns and a gallery are on the Core77 boards: it should be easy to use wood or plastic instead, for something more permanent.