This is my collection so far and I wish to continue to add. Any suggestions feel free to pm me I would appreciate it and I won't mind any adverts.
6X6X6 & UP
CUBE (SHAPE CHANGING)
The Bump Cube is a simple 3x3x3 Rubik's cube, but with an interesting twist. It spawned a whole series of puzzles and created a verb of its own.
A fully functional and fully proportional 4x4x6 made from a 4x4x4.
Meffert's version from 1982 with six colours.