Dvorak

Dvorak is a "Nomic" card game where all of the cards start out blank; players choose a theme, sketch enough cards to get started, shuffle and deal, then add further cards to the game as the game progresses (voting on whether or not to add the new cards).

It can be played as a throwaway party game of in-jokes and silly pictures, a cut-throat win-by-any-means Nomic, or used as the skeleton for a re-playable card game. (The web site has a printable archive of submitted decks, many of which are good enough to play as standalone card games.)

Similar to:

1000 Blank White Cards
Nomic