Please take a look: http://www.color-picker.de/en
(This program is freeware and is allowed to be distributed for free, complete and in original state only.)
Hi DesuDeus, you could use a standalone color picker and then only use the standard Windows one that MoI currently uses to enter in the R G B values.
You might also be able to find something that hooks into the system and replaces the standard colorpicker, but I don't know of anything like that offhand myself.
"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."