In the interests of karma (worldly not Reddit) having shamelessly made a thread promoting own designs and in respect to pleasant responses I got. I've compiled some of the entries I believe deserve your votes. My designs are not included.

THE DEVILS SHADOW :As much I'd like to win, with some minor tweaks I would love to wear this shirt. Has a great explanation for it too.

CHEVRON UNITED :Not sure if the red makes or breaks it, but, it certainly draws me to it, would wear either way. I own the last chevron kit (09/10) and they are not unusual for a United kit, vaguely historic.

UNITED FOR EVER :Simple, original, different and pretty damn cool. What more could be said. Not sure if intended, but has a historic nod too.

slight outsiders:

WORKER BEE STRIPE :Not sure about sashes as City used one recently. I like where this one is going though, with some tweaks it could look really good.

THE SLEEK DEVIL :Maybe looks a bit too much like a training kit and is made from the defaults but looks pretty good.

MANCHESTERUNITED Could look awesome with some adjustment. Really like the concept. Cleaned up google translate(you'll see if you click): This time Adidas has given the chance to design a third-kit of Manchester United to the fans. I wanted to design something different from the usual United third kits. I tried to make the design as powerful and clean as possible.

There's a lot to dig through so if you find more good ones please link them.