I build a lot of GUIs at work so people don't have to deal with changing directories, starting up applications with long complicated optional parameters, etc. What I realized today, was that I don't have a good toolkit of what I call "GUI Graphics". These are things like status indicators, which might look like a lit or unlit red, amber, and green LED. Or a AVI of a spinning gears to show something is processing. Or a group of BMPs of Start, Stop, and Reset buttons in both the pushed and unpushed states. Or a series of transparent PNG images of an analog gauge with the needle at every integer position from 0 to 10 and another from -10 to +10.
I am not looking for huge collections of general icons or 10,000 smilies. Think in terms of the types of things that might be useful on a GUI control panel for a business application.
So what resources do you folks know about that might fit my needs?