I really enjoy building mini ecosystems so I figured I would share some.
This is a little fen I made with some drosera intermedia "Cuba", duckweed and moss. It needs evaporation in order to work so I also have to add water back to it, not exactly self sustaining.
This is a permanent wetland in a jar, self contained and sealed. There's a drosera intermedia "gran sabana" in there and some moss.