I've been playing a lot of Diablo 3 lately, which means that when I hop back into World of Warcraft I really miss how awesome my D3 character always looks. The art style of the two games is very different, and some players will like one more than the other -- but mostly I miss the ability to customize my look to be exactly what I want it to be. D3 has dyes -- including a vanishing dye that makes armor pieces invisible -- that lets you control the color of every piece of armor you wear. And as if that isn't enough, you can also transmogrify the look of armor or weapon into any other armor or weapon that you have ever had. I weep just thinking of the bag space that would be saved if I didn't have to hold on to every piece of armor with an interesting look or color.
But for those who care less about transmog that's probably not a compelling feature set -- so tell us, readers, what features from other games (Blizzard or otherwise) do you wish World of Warcraft would adopt?