A long time ago I wrote a practical instruction manual for designing and running street games, with a card deck that lets you rapidly build, prototype and modify them with your team.
It includes artwork by the fabulously talented Viviane Schwarz.
The original files are still available:
You can also buy a pre-printed deck from The Game Crafter.
I'm not actively working on this any more, but always happy to get feedback or hear where it's being used.