I would like to see some sort of alchemy-like potion brewing table. Where a potion bottle is a reagent and you can add various herbs and such to make different potions. One or two at a time. Something like this would be awesome!
I'm not necessarily against this, but it is worth noting that it is currently possible to create various potions, of both arcane and divine based magic, through herbalism / alchemy.
Explore alchemy and herbalism. There may or may not already be this, and certainly is already things that put this sort of thing to shame by how awesome it is.
Most potion effects can already pretty much be achieved through Alchemy.
Potion brewing is basically a quick and easy (albeit at the cost of a lot of xp) to play an artisan if you don't really feel like gathering reagents.