Pretty cool Minecraft online skin editor, you can customize your own Minecraft skin to your liking quickly and easily, check it out here.
If you like Minecraft, be sure to check out other MMO games as well. Check out the newest MMO shooter Brick Force which looks to be lots of fun.
Also you can sell or even trade your Minecraft account on auction sites and forums. Check out the biggest wow trades forum around with a Minecraft category as well. If you do play wow, you can buy or sell wow accounts at ArmoryBids.