Let's face it, when you are painting, mistakes happen. Sometimes you can fix the mistake, and sometimes you can't. My sister, Dianne, throws these in the "poubelle". (She lives in Montreal, and that's what they call the "garbage can" there).
Now, I must confess that I am a pack rat. (You would think that I was raised in the Great Depression, but I'm not quite that old.) So when I make a mistake that I can't fix, I can't always bear to launch it into the poubelle. It goes into an envelope and into a drawer until I run out of space in my craft room/office, at which time I throw it all away in a rage of de-cluttering.
It's going to be even harder to throw away the mistakes now that I've discovered you can make them into inchies!