Making Custom Icons for Google Toolbar

I’m a big fan of Google and one of the products of theirs that I use regularly is the Google Toolbar. I’ve started customizing it more than just accepting the standard set of icons that they recommend, but I’ve run into a bit of a snag.

As you can see from the image above, I’ve got three icons that are all the same, but they’re for three different things.

Does anyone know how in the world I can change the icon that’s being displayed there?

It’s really annoying. I want to achieve something like Facebook uses (the icon next to them) that makes it really easy to see which button I need at a glance. As it stands right now I’ve got to remember,

“Okay was twitter the 2nd icon? Wait, no I added one for GoDaddy, was it the first or 3rd?..No, TinyURL was in there first…..arrggh!”

To help me keep my sanity, will someone please help me with this little problem?