Sometimes I mark my quilt tops before they are basted. Recently I redid a shower and kept the old glass door. I'm going to put it between two TV trays with a lamp underneath. I'm giddy with excitement to have the large area for my next tracing project.
p.s. It's not quilting, but I also trace clothing patterns onto freezer paper so my original tissue paper pattern is not damaged and can be reused. I used to do this on my sliding glass door on sunny days. Now I can sit down and do it any time I want with my shower door. Woo Hoo!