A blog called regeneration has posted some pics of custom Rubik’s Cubes available through a site called Rubix Corner. The site has 5x3x3 and 4x3x3 cubes, with additional layers that do not rotate, along with a number of double cubes that overlap and even a Rubik’s Cube cubed, three interconnected cubes.
Hey, thanks for the linkage! I’ll return the favor.