Personally I am fascinated about wings and aerial combat, and have always thought that this was a missed opportunity in minecraft, thus you can create you own battlefield and armor. Sword / Ranged fights in the air seemed like a great idea to me, especially when taking the increased difficulty with aiming in account. Of course the creative flight would be too easy for this, so I imagined a kind of... up-and-down flight, similar to the Angels & Demons Mod, which unfortunaly stopped developing at version 1.6.4, and only provided two (good looking) pairs of wings.
Although there are a lot of cosmetic mods out there to add wings (WearMC, MoPlayerModels etc), but I'd kinda like the wings to be functional too. Additionally most creations there are either boring or ugly.
I'd love to see a mod maybe adding spectral wings, similar to those the Angels in Diablo 3 have, or maybe some kind of Phoenix wings consisting of nothing but fire particles, in the best case animated and kinda moving and waving around. Of course classic dragon wings would be cool too, thus I always have the feeling that modders who include wings in their mods make them way too small.
I personally have no Idea of modelling and to be honest I failed poorly on trying, but I'm pretty skilled at texturing and if anyone would like to create a mod like this with me (or knows a mod who fulfills the points I just mentioned) please reply to this thread.