Went to a couple of succulent shops and farms today to get some rootstock for my grafting experiments (cue evil scientist laugh), but they didn't have any for sale, so I got these instead :)

Time to properly ID them and repot them into something prettier and more comfortable.

Edit: as far as I can tell, the purple one in the bottom left is a Sulcorebutia Rauschii Violacidermis, the other two (including the grafted one) are species of Frailea, the one in the bottom right is a Pelecyphora, and the succulent with beautiful red outlines is a Cotyledon. Do correct me if I'm wrong - in sure there are some expert cactus growers here.