Lepanthes telipogoniflora is a super neat one in my opinion

. tiny tiny and easy to grow and bloom in warm humid enclosures. Also check out lepanthes tsubotae if you like lepanthes. Some people don't care for them but I think they're just delightful! They are sometimes a bit harder to find but I think Ecuagenera USA and Tarzane group usually have them.
May I also suggest the strange Masdevallia erinacea for an easy and warm tolerant Masdevallia
If you want to get bold you might try some from the leafless chiloschista genus which are oh soooo cool. They would enjoy being mounted with no moss. Louisiana Orchid Connection seem to always have some in stock.