I played Aion for a few months (did that ever get boring fast), it had a cool feature that I'd love to keep seeing MMOs implement
The ability to re-model your visible equipment.
The way this worked was:
You took a piece of gear you liked the look of (dyeing was also possible)
You take a piece of gear you have to wear (because good stats are good I'm told)
Feed them both to an NPC
Voila! Your good gear looks like your old gear and still has all its stats.
Obviously there were some unique pieces that couldn't be remodeled or used for remodeling, but it wasn't a very large set of items.
They also augmented this system by having "costume vendors" that sold full-body outfits that looked like things, like formal attire, christmas outfits, kimonos, etc, that you could take and apply the model to your body-slot item and get the entire costume effect on a piece of gear.
If random outcomes aren't acceptable to you, then don't play with random people.