QR-Code CubeA custom sticker variant showing six different 2D-barcodes.
Ray Ban CubeI'm calling it this only because Ray Ban is the most recognizable brand on the six faces!
Relativity CubeA picture-variant of the 3x3x3. The images were adapted from one of M. C. Eschers most famous works.
Reptile CubeA 3x3x3 stickered with images taken from six different reptile skins.
Rhino JoggingThis cheap knock-off is slightly larger than a Rubik's Cube and features a cartoon rhinocerous.
Royal PuzzleThe official Royal Wedding Cube. Commemorating the wedding of Prince Charles and Princess Diana, July 29, 1981.