Op,
I know you said no licensed themes but ....Pat Lawlor for the win, but not B/W, Stern - Shrek or Family Guy for the pin. Easily found in new condition from $5k to $6k. One has clean language and the other more adult (I know you can turn adult mode off on FGY, but why would you)? Each share a lot of bathroom type humor. It's good stuff really and a nice option is to swap roms and enjoy two tables for one. Rules are pretty simple and either is great for bashing balls and ball bashing recommended above. A number of multiballs enter the picture and the humor in FGY is the funniest FU@KING sh!T you've ever heard.
Where are you located that there are rarely any pins around? Just curious.