I never heard about the coke thing but it would be neat to experiment with a small swatch of denim and a coke can. Let us know how that works; could work on other fabrics as well. It would be interesting to see the effect. I used to work for Levi Strauss and they actually used lava stones to wash the jeans and get them all worn looking. The second question I thought referred to where to get the pet screen. I have seen it at hardware stores but it only comes in gray and black there. To get it in colors, you have to get it in a fabric stre, I guess. Good luck.
PS- I've also heard, not tried it, that coke will do a bang up job cleaning the toilet. Now that we know all that, do we still want to keep drinking the stuff?!