Scrap Paper Lunar Egret

I've started making piles of my scrap paper and doing little pictures on them. I've been so busy working on contract work that I never seem to have time to to play and try new things. I'd like to keep this up. I used every medium in reach; water colour, gouache, acrylic, colour pencil, oil pastel. I also tried something new to me called Aquapasto which is like a retarder, it's a gum arabic and silica mix. Many of my favorite pieces started on loose bits of scrap paper that were floating around my studio, the Castle picture for example. What does everyone else do with their scrap paper?