At CES, I was able to take a video of the CubeJet, a flexible, full color printer. So far, the other full color 3D printing options are the Mcor Iris and the ZPrinter. The Mcor Iris (which we first saw at Inside 3D Printing expo in NY) prints on paper, cuts it out, and glues it together. The ZPrinters from 3D Systems use ink on a proprietary powder to glue together a shape. We see this a lot from awesome creations on Shapeways, where it’s known as the ‘sandstone’ material.
Here’s a video up of how the part can flex and what it looks like up close. In the background you can see the CubeJet printing this flexible full color material.