A while back on g+ I ran a game where I made up the rules on the fly, because I was running Monolith Beyond Space and Time and rules take a back seat to player decisions in that one. I had the players all choose from one of the following collections of items. This became their character and its implied class. Basically it was generic d20 fantasy. Players rolled a hit die the first time they got damaged and so on. 
Recently, I've encountered more than just the 4 original ones. If you go to this site, you can get a ton of them for a more modern campaign. You are the person with ababy! Go!
The Spagetti Western collection I found has to be approached a different way. I think the key to that one is to have players choose a character from the pictured ones.
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I would love to know if anyone has created more images like these!
