When Blizzard half-seriously apologized for the brutally ugly Season 4 Brutal Gladiator gear by saying that their artists were hard at work on the expansion, they weren't kidding. If any of us were afraid that there'd be massive clown action, we can rest easy because from the look of things, even green items have an epic feel to them. The designers over at Blizzard have done a fantastic job making the green quest rewards in Northrend look impressive and even menacing that players won't feel embarrassed to equip them.
I haven't checked out all of the armor pieces, but a quick perusal of the weapons shows that Northrend won't be a total circus when we finally get there. I mean, just look at the gun above. That looks really badass, specially with the skull and weathered metal. Check out pics of uncommon, or 'green', weapons found all over Northrend in the gallery below. [UPDATE!] By popular demand, I included a couple of green staves and as a bonus, took a sneak peek at the two blue quest reward items for Death Knights. I know they're not green, but they're pretty cool, nonetheless.
Gallery: The Beautiful Greens of Northrend