Use old jeans, cut into squares, add some batting material to the center, sew edges together. Either sew or draw the "X" and "O" onto them and instant tic tac toe game for kids! - Cool to do with beanbags too.
Turn the legs of your old jeans into fabric baskets. This tutorial gives measurements for making 3 different sizes of baskets. This is quite clever. They would look quite nice on a dresser for loose stuff.
Fun Dollar Store Crafts for Teens - DIY Denim Pocket Organizer - Cheap and Easy DIY Ideas for Teenagers to Make for Dollar Stores - Inexpensive Gifts and Room Decor for Tweens, Boys and Girls - Awesome Step by Step Tutorials with Instructions for Cool DIY