You all really came through for me. We found some thin, painted paneling at Home Depot. I can get 5 shelf liners out of each piece $13). So that's the way I'm probably going. It will be fairly quick and nice and smooth with no seams. If I cover them with foil they'd also be very bright. The 4 shelf liners I bought at Amazon are also very nice. Maybe I'll sell something(s) and buy enough of them to do all my fabric shelves. Thank you all for the great ideas. When my room is in order, I'll publish pictures of my "new" and much improved space.