One of the great things about 3D Printing is that complexity is free, which means customization is free. We have a large number of co-creator designs in the Shapeways galleries that are customizable, which means if you are a designer, you can offer to modify your designs to your customers requirements. If you cannot 3D model it means you have a way of getting a designer to customize an existing designs to your specifications.
Here are just a few customizable iPhone accessories from the Shapeways gallery.
The CardCase for IPhone 4 - Customizable
$43.52
Clockwork iPhone 4/4S Case Personalized
$36.00
Iphone 4 / 4s case - Cell 2 -Customized
$37.92
iphone 4 WALL HOLDER with your own text (91 V1)
$41.14