Still in the concept stage, the Touch Color is a device that would allow visually impaired people to create two-dimensional art:
This innovative device comprises a Rainbow Picker in a form of a scroll wheel, which contains Braille dots that allows blind people to select a color from 24 available. After selecting a color, this device differentiates the colors by generating varied temperatures through LED bulbs. Then the user can paint on a thermal art board by using their fingers and the thermal-color display technology keeps the track of the lines and colors the blind artist is using.
There are more pictures and diagrams of this gadget at the link.
Link via GearFuse