There are lots of miniature orchid suppliers; just google "miniature orchid". If you live in the eastern US you can easily collect some stonecrop (Sedum) outdoors; look along wooded streams and moist bluffs; it often grows on mossy stone outcrops and tree trunks. You can probably get it from local or online nurseries too; be sure to get one of the small species such as S. ternatum, S. pulchellum, S. album, S. kamtschaticum, S. spurium, or S. acre, and not a big sedum like 'Autumn Joy'.