Back when I was taking cuttings from a variety of succulents, I tossed some bits of a small sedum ground cover into the glass baking pan full of little pebbles that one of my orchids sits on. I meant to just let it 'heal' a little before sticking the cuttings in a pot someplace. Well this stuff roots so easily it rooted in the pebbles and so now my orchid has a little garden under it. I think its kind of pretty so for now I'll just let it be there. Semi-frugal Serendipity!