Use bits and bobs you dont need to make one of the most useful things in your school bag!
1
Cut the fabric slightly longer than your zip length ways and you decide what looks best width ways by folding it in half.
2
Stitch to the zip, and stitch the the edges. I folded over the side of the fabric and stitched that on because it looks good with a ribbion through it.
Make holes through your doubled over edge(if you have one) and pull a ribbon,lace,wool whatever you like through.
Nows the fun bit, adding the junk!
I stitch on a patch, some groovy looking fabric scraps, some beads, a safety pin with some charms, badges and some plastic toy pieces(ello rocks!)