There's myriad ways to make anything into fabric - old fabrics, scraps, teatowels, shower crutains, plastic bags - you name it! And then you can make stuff with your new fabric - anything you fancy. So get creative with your fabric making, then get stitching to make something new!
Use old shower curtains and other waterproof materials to fashion a brand new shower curtain!
A review of the gorgeous book "A Second Skin" by India Flint, which has a wealth of information on extending, re-using ,refashioning, re-purposing, mending and salvaging fabrics from your clothes.