I use Proxi for a couple of things, but my main use is to control iTunes with it. I've got three shortcuts setup to go back a track, go forward a track, and pause/play. It's awsome. I realize there are a ton of other ways to do this (including using FlyGesture!) but it's just quick and simple for me and I like it.
Anyway, I was just playing around with Proxi today and I noticed each one of the little icons for my shortcuts were customized to what the actual shortcut was:
That's cmd-control-right arrow, cmd-control-down arrow, and cmd-control-left arrow. I thought that was pretty cool and I just had to share.
(Proxi is written by Casey Fleser, who hopefully still has all his fingers.)