Horde scarf and a Carrot-on-a-Stick keychain
It's just starting to get a little chilly here in Chicago, so the timing on this Horde Scarf is just perfect for me -- it looks really comfy, and wrapped around your neck, it's just Warcraft enough to get noticed by people in the know, but is still classy enough that it looks like a cool design if you don't happen to recognize the Horde symbol. I like the look of black and red (would go great with my black overcoat), but amlowi, the seller over on Etsy, will do it up in any colors you like.
And speaking of doing things by request, this Carrot-on-a-Stick keychain is awesome, and the artist who makes it (she paints in acrylic and then coats it in enamel) will make it out of any icon you like. Carrot-on-a-Stick seems perfect for a set of car keys, but it's not going to be in the game forever, so if you want to put a class or faction logo on there, she says she can do any icon in the game.
Always astounding to see what these industrious WoW crafters are up to. If you've seen a cool DIY WoW-related item, let us know.
