Fissidens fontanus would work really nice for that if you can get a hold of some. I believe most of the available aquatic mosses would work while being more tame than java moss which tends to follow directions as well as a cab driver that thinks you don't know where you are.

Actually I used to have some nice lush emerald green algae growing on my driftwood and it blanketed most of the piece. After I moved it to another tank all of the algae died off and I really miss the look that it had so I may try so re-create the effect with some Fissidens fontanus if I can find any.

 

Nice looking plant! Let me know if you see any

 

I've got some Hydrocotyle Sibthorpioides that seems like it might attach itself to drift wood if I let it. It can be difficult to find and seems to prefer high light and CO2 so it may not be the ideal plant to experiment with unless you're somewhat experianced in keeping plants.