I am in the process of making one now. If if comes out well, I plan on making a second one as I have plenty of material.
The one I am working on is actually for my daughters back seat of her car/truck for when they bring their Siberian Husky. Yes, my granddog will have his own quilt!
I have never done the photo thing yet, first of all I don't understand how the ink doesn't run. But I think the idea is great. But a lighter cover heavy weight material would look great. In my opinion just be careful about the weave as you don't want the ink to run.
Good luck! Can't wait to see the pic's.