Shotgun Showdown is a two players western styled shooting game which utilizes two $20 bills as an arena/required marker. I wonder whether the winner takes both bills.
If you thought that tracking dollar bills was original, than get ready for Volcano Fever, a game that uses condom wrappers as a marker. It's more than just a weird artistic choice by the game designer. The goal of Volcano Fever is to teach proper condom use.
I understand the volcano metaphor, but what's the octopus supposed to symbolize? ... Anyway, next is, as promised, Nerdferno, a game that puts you in a God like position, determining the fate of cubicle dwellers. If you looked for original AR content, you've found it:
You can read more about these games and others, such as Spintopia and Bug Juice, on the studio's website, and about previous AR games from Georgia Tech here.