I was thinking of redocarting my 10 gallon with a saltwater/marine theme, actually...but it would seem like a waste of the decor I already have in there.
I know petsmart sells some fake corals. Of course, i'm assuming you'd use sand as a substrate?
I was wondering...I have a dried up starfish that my uncle gave to me. Would it be safe to put it back in a tank? If it is, you could always get those.