Besides creating shirts myself, I have also had the pleasure of working on or providing graphics or ideas for other lot merchandise. One recent one you may have seen at 8 was this Alaska themed shirt. The front featured an old piano with the Alaskan mountains springing up from the top. The back I didn't work on, but it featured the Alaskan Flag and a couple of lyrics "I'll stay right here" and "Far away from you".
I don't know if there are any of these left, but they were last seen on Reality Tour under the name wolf_sis.