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)
A fully functional and fully proportional 4x4x6 made from a 4x4x4.
Meffert's six colour 1982 version. Roughly 31 mm along an edge.
A Pyraminx with the four tips connected to make them nontrivial.