I frequently find myself testing out new colors for elements (finding that one doesn't work with the rest of the color scheme). Unfortunately, the process when using even firebug or google chrome is hit and miss (try lots of different colors by manually typing in the codes, find out that the color doesn't look good, look up another hex code, try the next color, etc etc).
Is there a better app or approach for this? I'm thinking something like the color pickers in photoshop and elsewhere where you can change the color using sliders to find a better one.
A trivial example of a color picker like what I'm looking for, just for clarity: http://www.colorpicker.com/ But it would be changing the element in the page, of course.