I don't have much artistic talent or time, but by searching for freely available icons on the web and making my own fullscreen icon, I was able to come up with the attached image.

I can't redistribute the icons themselves, but something like this would be nice.

I actually swapped the GPS enable/disable icons, since I found the default arrangement confusing (ie. if I see a picture of a satellite, I expect it to indicate that GPS is currently enabled, and that pressing it will disable GPS).