Hermès has jumped on the DIY wagon with it's free downloadable paper Hermès Kelly bag that you can decorate yourself or choose from a variety of designed prints. (To get there, go to the Hermès homepage and click on the thumbnail in the middle that says "i want it, i'll have it!" along with the image of a blank white bag.) If you are particularly crafty, you could use the template to make your own version of the bag in fabric.
Related Coquette Posts:
Fendi Paint-Your-Own Baugette Tote