I'm a big fan of Platycerium bifurcatum, also known as the staghorn fern. Unlike a lot of ferns, they're not really particular about pH or humidity or soil quality, and they're also somewhat succulent. They CAN be rot prone, I've heard, and they don't really like it if you let them wilt constantly, but watering's not really particularly difficult. I have noticed that young plants are sort of prone to spontaneous collapse. Larger ones are a lot easier for some reason. Also they really benefit from going outside in the summer, and they don't grow constantly. Individual fronds last about three years before falling off. sort of prone to scales. It's not particularly hard to keep scale in check on these, though, because the foliage is really sturdy compared to a lot of ferns. Also the shape of the fronds make it fairly easy to spray them down/scrape if necessary. Also there's lots of cool hanging cacti. Rhipsalis salicornioides is a nice one. You probably want to avoid the spiny ones because I DOUBT you want spiny plants at eye level :) Epiphyllums are one of the coolest things in the world and I'd have one if they didn't get huge.

Probably the easiest are those that do not require any kind of a dormancy [or rest] period. Ones which instead like warm moist conditions all year round. Drosera [sundews]: some good candidates: D. capensis, & D. spathulata lowland Nepenthes: such as N. gracilis, N. ventricosa, N.ampullaria ***be forewarned that pretty much all the neps will at some point outgrow a small terr [15 gal or less] - and most rather quickly [w/in a year or two]. Pinguiculas [butterworts]: ex. P. primaflora Sarracenia [terrestrial pitcher plants] ***same problem as w/ neps Utricularia

There are actually quite a few candidates depending on the conditions you wish to provide. There are a multitude of very small to true miniatures in the orchid family. You just have a bit of research ahead of you. *For cool to intermediate temperatures: Masdevalias, Draculas, Dendrobiums, and Restrepia are some examples. *For warm temps: some mini-Cattleyas, Dendrobiums, and Epidendrums/Encyclia would be some examples.

maidenhair ferns, heart fern, small adiantum, button ferns, brake ferns, & selaginalla Note: Concerns w/ collecting moss from outdoors Wild patches of moss can be very slow to recover from the depredations of collectors. Rather than damaging/destroying the micro-ecosystems these are a part of, it is best to leave them alone. Further more wild mosses are usually very specific with regards to their habitat. A moss growing on a rock is not going to be happy growing on wood mulch for example. Unless care is made to duplicate their microhabitat, they rarely flourish when brought indoors. Also wild mosses may harbor unwelcomed critters like snails.