Here's a quickie project you can do using an old pair of jeans. Cut a bit of fabric and insert it into an old pair of jeans that you've reconstructed ever so slightly, and you have yourself a denim skirt with flair. The author prefers hand sewing, but you can use your machine for a more polished look. This can be made for anyone at all from any size jeans. You can piece the insert with several fabrics if you like. Upcycle that old holy kneed pair of jeans! Keep or give as a gift. (Alternative directions)
You can never have too many denim skirts and what better way to get one than to recycle jeans with worn knees.