kindle cover, which I originally made with a black hair tie as the closure loop, Sewing through it didn't do the hair band much good, and the inner rubber band broke almost immediately. I ripped out the hair tie, made a narrow fabric loop, and stitched that in. The stitching isn't as pretty as it was before, but it's much more functional.
Then I machine darned a hole in the sleeve of one of my hiking shirts. I happened to have just the right color thread, and it turned out to be very easy. I also stitched up a hole in the seam of my bright pink long-sleeved t-shirt, something I've been meaning to do since the second time I wore it. The hole was a manufacturing defect - the edge of the fabric somehow didn't get caught in the seam.
I also felted a little flower over a hole in my striped cashmere sweater. Still left to be mended is one of my pink socks, which unfortunately has a manufacturing defect - somehow I left a live stitch in the lace pattern.