Double D Dragons might not be so bad... (Could get Ronda Rousey and Gina Carano to pose for back glass.)
Best idea I've heard for a pin I've heard in years is from my seven year old design, "Monster Rampage". The player is a giant monster destroying a city. I don't think it's been done. He has a little building bash toy and an under table play field where you have to spell out, "STOMP" in stand ups before a timer runs out and you lose your ball. It has two spinners and three on field locks, but to get the third, which starts multi ball, you have to hit all the drop downs to spell, "Monstr" and "Rampaje". (Cut his spelling some slack, he's seven.) That enables you to drop the two BIG tank targets that hide the third kickout and that starts the Rampaje mode. There's a little monster toy in the middle of the playfield that then spins around with his floppy arms flinging the balls all over the place.
The lay out could use some work, but the theme is fucking top notch.
Oh, haha, and the lanes spell "S.O.S."! Ha. I love that boy. I've been thinking of starting a thread to post all his playfield designs but I'm not sure if it would be considered sort of indulgent parental spam. It's not exactly high art. Let's just say his design concepts and rules are more advanced than his drawing skills!