Yeah, I replaced the riccia on the large piece because it was a pain to maintain. Taking out that hunk of wood every other week to trim the riccia isn't very practical. I liked the way the moss was growing so when the last of the riccia broke away I just wedged some moss on it and it takes care of itself. No mess, no worries. Its also easy to pull of when it over grows, as long as their is a tiny bit left stuck on the wood it grows back nice and full.
Heres a pic of what i mean with the moss...
This is a pic of how the tank looked before i cleaned it up (last pic posted).