I think in the far future, it would be cool to introduce a new customization feature to the game in the form of swappable gear (for hunters) and mutations (for monsters).
Hunter gear would take the form of different, swappable pieces of armor that you could mix and match on each hunter. Much like the armor customization from Halo, gear could range between new armor, helmets, beards, etc.
Monster mutations would allow players to customize different heads, body parts, and skins. Allowing players to create almost-new creatures to spice up the monster experience.
What do you all think? I'd like to get a lot of support (beit community or developer) for this idea.