I don't have a picture...but I add fabric plants, and if the space is willing a small cave with gravel of course!! Or it can be used as a hospital tank... Which I have a cave and a fabric plant for them.
Oh, wow. I just had this mental picture of a small tank filled with moss balls; not just a layer on the bottom, but different sized balls stacked up so there are lots of nooks and crannies. Then a colony of some Red Cherry Shrimps picking their way around the moss.