Along with a few prints that turn out, I make a vast amount of bad prints:  boring, dorky, blurry, wrinkled.  I feel like I should apologize to the beautiful paper for what I put it through.  Many of these are stuffed deeply into the garbage.  In those I keep, I look for anything salvageable, a moment of beauty, interest, or even humor.  I use this as a starting point.  Then, I try to make the most of these mistakes by cropping and drawing on them.