Edit: 12/3/2012 - A complete Reboot!
Every other comment on the first set of Minecraft chibis:
was asking for somebody I'd missed, so... Lil' Minecraft set 2, now featuring slimes, Steve, silverfish (I don't understand!
), the Ender Dragon, blaze, magma cube, and some of our more delicious friends - pig, cow, and chicken.
And the painting that started it all:
Many of the pieces from this gallery are available as prints through ghostfire.net
or specifically at the ghostfire market