With the help of seasoned GNOME artists Lapo Calamandrei, Hylke Bons, and Jakub Steiner, I was able to create the following GNOME-y icons:
I used the already-existing clock icon, stripped down it down to its bare face, and layered the fuel gauge type stuff on top. I don’t often get the chance to create icons (certainly not at all the sizes pictured here) and I’m hoping to get better at it. Of course I still have to try my hand at a high-res (256x256px) version… :)
The Inkscape SVG source is available.