Apron out of jeans. looks to be one piece using the whole leg split at the center front or center back. leg style or shape would play a part in the final shape of the apron. wide leg or flare jeans would make a fuller apron I imagine
Being Green with Denim Blue Jeans - Up-cycle some old jeans and craft a DIY Denim lampshade. (Take into consideration the weight of your finished lampshade and be sure to pair it with a sturdy lamp that won't topple easily.
to aprons This is another interesting and funny way how to use old jeans. Take one trouser leg and cut it in apron shape. Take some other old fabric, and cut it in thin ribbon. Sew them together to get aprons from the old jeans as shown bellow.