The Meaning of Life, the Universe, and Everything.
I would like to see crops that can grow on walls in minecraft. Sure, there's cocoa beans, but those don't have a lot of use to them. I don't currently have an idea of what they would be, other than cucumbers, possibly, but I do know that I need something to fill my empty walls. Feel free to suggest ideas.
For orchids especially, introducing a very wide variety of visual 'types' created by something akin to the 'spinner' code used for the tropical fish (assuming that code is not part of what is pruned when the much neeed lag fix is [finally ] made) might be introduced.
One option would be to make these orchids purely decorative: with no ability to craft into items, minimal/no collision boxes [as signs/torches], and no lighting requirements. [An additional level of variety might be added if the orchid changed depending on the block (not necessarily limited to the wood types) on which it was placed; the same orhid whould thus appear different if placed on oak vs jungle wood (and potentially on cobble vs smooth stone).]
Another possible wallgrowing addition would be something like Spanish moss [qv https://en.wikipedia.org/wiki/Spanish_moss] in addition to the vines now found in jungle and swamps.
Making the new Spanish moss able to spread only to wood (& possibly wood based blocks) or straight down would differentiate it from vines and provide a vine-like ability with easier control of its spread.
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WARNING: I have an extemely "grindy" playstyle; YMMV — if this doesn't seem fun to you, mine what you can from it & bin the rest.