This is the only one I know of... It's trademarked, so you'd have to get permission from McLemore if you were planning on selling them...
There was a thread on this a long time ago (making KLOV shirts) but I can't seem to find it now, I know it was back on the old forum software.
I was thinking once about trying to design a KLOV shirt that looked like something a radio station would give away... Something like "KLOV 88.1FM All 80's All the time"