Catherine,
A clownfish will "host" with just about any wavy LPS or soft coral. Pretty much any coral that moves around like an anemone, they will probably pretend to host. The only reason a clownfish needs an anemone is for protection in the wild. In our tanks, we protect them by not adding sharks and large triggers and other predators, so they have no need for one, unless you have a mating pair in their own special breeding tank.
So, if you want to see a clown rubbing itself onto some tentacles, long tentacle plate corals, hammers, even mushrooms are good "homes" for them, just depends on your clown's personal tastes :)