I have this Dragon Scale Mug, which apparently is now out of production so you should be jealous.
And this Oak and Acorn Mug, which was a Kickstarter reward and stunning.
While I may not be a knitter, my fiance is and I'm just looking for an excuse to buy him one of these.
And my little one loves her Renn Faire mug.
Here's where you can find more of these beautiful things: