I don't throw out much. I used to throw out mistakes, wanted to scrub them, forget them, move away from them. Now I think mistakes are generally lying in wait, ready to be cut up and made into something that makes them even more awkward and even more terrific.
This piece didn't involve mistakes, per se, but proof prints with colors that weren't what I wanted. Printing greeting cards particularly seems to result in a lot of "oh, crap!" moments. I intend to get through this pile eventually, adding them to journal pages like this one.