I used to smile when my OH talked about her lovely "semperviviums" (sic). Every time we went to a garden centre she would browse looking for new ones, at less than £1. I let her get on with it, buying, planting, replanting offshoots. But recently I have become a real fan. Some have really lovely leaf colour and shape, some with a fine cobweb like fur on top. What I really like is that they are a) evergreen, so good ground cover b) very hardy (we haven't lost one in the last two cold winters), c) withstand drought when most other plants are suffering, and d) so easy to propagate. They can die in the middle after flowering, but by this time 10 or 12 offshoots form a ring round the old parent, so you just do a little rearranging.
Tomorrow we are off to the garden centre to seek out some more, and some baby bush tomato plants.