We're discussing colors today, so this section might as well be about it; for the sake of consistency, at least.
Stay away from the color picker.
Really; don't touch it unless you know exactly what you're looking for, and have a color-accurate display (which is not most computer screens) to show you what you're picking.
Most applications give you access to pre-installed high quality color palettes. There are also free-to-use, high quality color systems that you can pick colors from.
RGB, HSV, and HSL values are also flawed, so you can't trust them to generate palettes for you numerically.