Yes, a cactus has come to mind, and those are all beautiful. However, it would have to be big enough to fill the complete top of the container or they will meander around it and dig in the dirt around it. I've seen them do it!! This is why I would love to have a HUGE Barrel cactus, but a mature specimen is about $ 150 +.....
I had a similar but smaller Agave in the pot before and they pretty much ruined it.