Great plants! Some of them have gone onto my wish list. Here are a few of mine:
NoID I grew it from seed back in the 1980's
E. mammillaris variegata - also from seed in the 80's
Maybe also E. mammillaris
Euphorbia bupleurifolia
I should know the names but I think the plants ate the tags and I'm not willing to die for this project.
E. lactea - they were all grafted but I thought that they all contained enough chlorophyll to make it on their own. I cut the lactea heads off and freed their hosts to live they own lives. Six months in, so far, so good.
Euphorbia decaryi