This guy has set out to draw 10,000 drawings on 3x5 cards. As of a few days ago he was at 1,470. He's a walking talking example of creativity by doing. Are all of them great? Probably not. But many are funny, thought provoking and worth checking up on. And if you really like them, ask him and they are available to buy.
But whether you are in the market or not, they are inspirational because he's doing it. We can too.