Mixee Labs is a 3D printing startup run by an ex-colleague of mine, Nancy Lyang, and Aaron Barnet. They are creating a platform that makes it easier to design 'apps' that allow people to easily create printable products.
With their latest product, all you have to do is create some Shape Keys in Blender and export them to the Mixee Labs website. It's pretty clever :)
Using Blender’s Shape Key feature, you can create objects that morph, deform, and twist. Let others play and tweak your designs, then purchase their creations in a variety of 3d printed materials.