As an Amazon Associate I earn from qualifying purchases.
Other links on this site may lead to other companies that I'm associated with.
I like Sedum spathufolium; it's compact and slow growing, plays well with others, and if you're very lucky, it will produce some vivid yellow flowers for you.
Grow this in well drained soil - in it's native habitat, it grows right on top of granite rocks. Use in containers, it makes a great foil with other types of Sedum and Sempervivum.
Look at the other two great cultivars that it's parented; Sedum spathufolium 'Purpureum' and Sedum spathufolium 'Capo Blanco'.