Hi there!

Jovian does that trick!

http://joviancolorpicker.com/Features.aspx
http://forums.luxology.com/discussion/topic.aspx?id=44782

"Replace the Windows Color Picker
The newest feature in Jovian is its ability to override the standard Windows color picker, meaning that anywhere you would've had to use the Windows color picker you'll instead get to use Jovian."

Don't forget to check out the Colo(u)r Library.

~,
Marco