Comes in black, grey and white, and red, orange, yellow, green, cyan, blue and purple.
Available only in creative mode. More (real life usage) info here. Wikipedia, Chroma key
Hints, and colour hex codes included.
License: Do What The **** You Want To Public License version 2.0.
HEALTH AND SAFETY WARNING
Using this mod extensively and continuosly may cause sore eyes.
Please take breaks when using it.