I just got back from WDW at CSR. Stayed May 19-27. For those wondering, I didn't see any resort mugs except the blue, pink, and black. I visited several other resorts and didn't see any green, purple, or orange, nor did I see anybody carrying those in the parks. CMs I spoke to knew about them but haven't seen them lately.
However, Magic Kingdom sells the same mug with a different graphic in black with silver glitter. Hollywood Studios also sells the mug with their own design in clear purple. You get one drink in it when you buy it, but it's not refillable.
Typhoon Lagoon (and I think Blizzard Beach) sells one in gold with a faux leather sleeve and no handle. You get this one in lieu of having your $5 locker deposit returned. The refillable drink mugs at TL/BB are a different shape than the Whirley CM-16 model the others are.
So, if you just happen to like the mugs and don't care about free refills, there are other designs you can get.
I have pictures but I can't post the link. Just change hxxp to http:
hxxp://i.imgur.com/mid53.jpg