KnobMan is a wonderful application designed for creating graphical knobs. It was created by a genius I only know as g200kg.
There's been quite a few times in the past where I've tried to create graphics for my plugins only to fall flat on my face. The only success I've had has been using g200kg's programs. That just goes to show how helpful they are.
While KnobMan was originally created for rendering knobs, it can do much more. VU-Meters, LEDs, Buttons, Switches are just a few examples of what it's capable of. The KnobMan files you find here are free to use however you wish.
If you find yourself using KnobMan, be sure to drop by g200kg's website and make a donation to support his efforts.