I’ve gotten a couple of questions about saving selvages, so here are the answers.
1. Do you save both selvages, or only the printed ones?
I save only the printed ones, but I have read that some people save both.
2. How wide do you cut them?
I cut mine 1.5″ wide, because that’s what the Selvage Queen 
Karen Griska recommends. I find it works great. I measure 1.5″ from the finished selvage edge.
Another note: I saw fabric recently with a Mexican theme, and the little color windows were all shaped like tiny Mexican hats! Imagine how much fun we’ll have if fabric companies start making their selvages with artistic considerations!
What a neat idea. I haven’t been saving selvages, but think I’ll start. Can imagine some really fun projects for all those strips.