You have nothing to do at the moment? Here's a color perception test.

Your score: 16
Gender: Male
Age range: 30-39

Your score: 0
Gender: Male
Age range: 30-39

Shitty monitor at work here, so I got 3. Could have done 0. This is a good test.

This is more like a game, but still good. Need a good calibrated monitor though:
http://www.kuku-kube.com/

My Score: 3

4, thought it be way worse with a crappy TN monitor, since they're not supposed to be the greatest when it comes to colours.
(Right, and had the f.lux running, RIP accuracy.)

Your score: 8
Gender: Female
Age range: 20-29
Best score for your gender and age range: -80
Highest score for your gender and age range: 567471

Didn't spent too much time on it, I'm pretty sure I can get the 0 if I wanted to. :3