I'm sure their are other ways to do it than the one I figured out but yes I do. Under each color there is a letter or number combination, I'll use black for an example since it is my favorite one to mess with. Now under black is #000000 I use the letter a to change this, for dark red I make it #aa0000 dark green #00aa00 dark blue #0000aa. If you put all a's you get grey, you can experiment adding a couple a's here and there throughout the color spectrum and come up with all kinds of stuff. Hope that helps you out ;)