http://www.xrite.com/custom_page.aspx?PageID=77&Lang=en
A couple of days ago someone posted this on tumblr (well ok, many days ago) and I find it quite a good way to test how sensitive you are to colours. The way they did it looks logical too with 2 colours of the same shade on a linear scale but the hue is different enough to see, and the test is to arrange the palettes in the middle to gradually shift the hue accordingly. How accurate you arrange the pattern is how acute you are to the slight changes in colour hues.

http://cl.ly/image/3V1B2e3V3D3o
Here was mine if anyone's curious. If anything it proves that I should definitely not be your interior decorator for your living room, ahahaha.

http://commissions.necktiedog.com/table.html
On another note, I've made a commission table. But there was a terrible flaw in the system and I've now updated it and trying something different, basically I reshuffled it so now it alternates between those who paid earlier and those who requested a slot earlier so it should be a bit more fair now, I hope ;3;