Terrarium

I've set up a little terrarium in an old aquarium--yes, also squeezed into the bathroom, along with the propagating ferns. There is something fascinating about them, the way they form microcosms. I've planted an Asplenium bulbiferum (hen and chicken fern, on the top left of this image) which grew from an adult plant in my garden, mosses, liverworts, lichens, and some Utricularia gibba in the "lake".

Incidentally, if you're interested in setting one up, there's a good trick to keep the water fresh. Before putting anything else in the tank, put in a layer of charcoal (best obtained from a aquarium shop and used for aquarium filters), then follow that with the sand, rocks, soil, etc. This limits the growth of anaerobic (ie, stinky) bacteria.

There. The perfect bathroom decoration. Better Homes and Gardens will be beating down my door.