I love the Pleurothallid alliance, Plleuros, Draculas, Masdevallias, etc... there's tons of them and they almost all have amazing blooms if you like small and strange looking! Do your research on them and see what elevation they come from, just like a Nep. At least, that's how I treated my orchids. Any tropical orchids originating over 1000m/3000ft went into the HL chamber anything under that went into lowland. In my lowland tank the days were 85-100*F and nights were 70*F -75*F, this still has a temp drop even though it never actually "cools" but it seemed to be enough for the plants to bloom and do their thing.
P. Schiedei was a great little plant. I had one for many years on a twig - maybe I'd gotten it from you Tony? I recently got a gigantic unlabeled Pleurothallis, I've never seen one with 20" tall leaves!
Bulbophyllum / Cirrhopetallum are great too, some are huge but many stay in the 4-6" leaf range with strange alien looking flowers with bobbing, wiggling, furry bits to attract insect pollinators. I have Bulbo/Cirr. fascinator, I can't wait to see the blooms on it that look like a strange purple dagger/insect. I had one species years ago Bulbo beccarri that grew leaves kind of like a shingle mushroom, it looked really fantastic mounted on a slab of cork bark. Good luck finding this one nowadays apparently.... I've been looking for one again but not succeeding.
There are some really nice small Phalaenopsis species like P. schilleriana many others that grow and look great mounted on twigs and things. This particular plant has kind of silver and green speckled leaves so it looks cool even when it doesn't have it's multiple pink blooms, it's a relatively small plant 6" IIRC but it can create a gigantic floral spray.