I have cat beds all over the place, but the kitties still prefer human beds, couches, chairs, the floor. The kittens do still use a "carpet condom" just like what UniqueViking posted and they start at about $10 at most any store - WalMart, PatsMart, etc.

The other type that gets used quite a bit is Eliot's bed. It is a soft fleece with a dome- best on a high place:

but the VERY favorite bed: