Seat cover for dining chair. Clean, simple wrap around design that fits snugly around legs with velcro. This would be simple to make by altering this DIY: http://www.athomeonthebay.com/2012/03/dining-chair-drop-cloth-slipcovers.html
Wooden boards with wallpaper, take sandpaper to it, I would love this on any wood project. Table, bench, chair, picture frames, maybe even a floor that you would satin varnish over. So many possibilities. Love this!