I like the idea! There are so many crazy species out there.
Some interesting growth habits:
Grammatophyllum speciosum - monstrous cane-like pseudobulbs
Vanilla aphylla - huge leafless vine; there are a couple other leafless Vanilla species, I think (these and G. speciosum seem a bit difficult to keep in cultivation for space-limited growers lol)
Angraecum distichum
(a host of sect. Dolabrifolia species out there: A. aporoides, A. bancoense, etc.)
Dichaea - similar distichous growth habit
spiky seed capsule:
Dendrobium teretifolium - terete, pencil-like leaves (several similar species out there)
a similar species (D. striolatum):
Dendrobium cucumerinum - warty leaves
Dendrobium pugioniforme - thin pointy leaves (specific epithet refers to the supposedly dagger-like shape)
Dendrobium linguiforme - leaves look like tongues!
(lots of other sect. Dockrillia)
Dendrobium cuthbertsonii - warty leaves and bright, bright flowers
---------- Post added at 03:40 PM ---------- Previous post was at 03:29 PM ----------
Paraphalaenopsis also has these giant pendent semiterete leaves. Some Holcoglossum too...
Paraphalaenopsis:
Holcoglossum:
Lots of Paphs from multiple sections have very pretty foliage too - P. concolor, P. purpuratum, P. delenatii... the list goes on....