Ok Shapeways Rubik's Cubists, here is a concept ready to be realised, a Rubik's Cube with Braille....
With the concept by designer Konstantin Datz. The colors of the Rubik's Cube are replaced by Braille symbols. A sweet idea and a little more visually pleasing then the DIY Blind Man's Cube on Instructables (but perhaps this would not be an issue to the blind?)
It would be so nice in a conceptual kinda way if the braille read blue, yellow, green etc. considering it would be an abstract referral to a color that might never have been seen..
UPDATE: I just found a little more info from Datz and the braille does (of course) refer to the colors. Nice renders too.