Paint Colors
Zplugger-
I'm assuming when you are saying "Paint" you are in fact referring to the Windows Paint program that comes pre-installed with Win 7. Even if not , the procedure is essentially the same, its just a matter of finding the area to go to to edit colors.
That being the case, to get to the color pallet you run the paint program , then look for a selection for "Edit(or choose) colors". Click that.
After selection a "Color Palette" will open showing you the basic colors and a type of "color wheel".
What you may want to do is select from the basic colors one that is closest to the color to want to make. Then use the color wheel to fine tune it to the color you want. OR alternatively if you know the "hex code" of the color you want you can enter that as well.
Once that is done click the button "Add to custom colors"(or to that effect). This will add it to you Custom color palette which can they be accessed the same as editing colors or i THINK you can insert it in the palette at the top of the main paint window.( the last part, adding to color palette on main Paint window, I would not personally know of due to the fact that if i do a custom color I leave in in the edit colors area).
Hope that helps and isn't too terribly confusing.
-LoneWolf