Any ideas for ornaments for clown loach tank?

i have about 6 clown loach in my tank they are relativly small i'd say about 2" or so and all i have in my tank at the moment is a tree root thing that they hide under and stones =\ it seems really empty and i want some ideas on what to buy to put in there to make them happier and make the tank look better any ideas? links appreciated xD thanks.