Those rubber shelf-liners are the best thing since sliced bread! I've used them for everything from putting jigsaw puzzles together on them (if you're careful, you can simply roll up your in-progress puzzle and it will keep everything nice and tidy), to a handy non-skid surface for holding small parts, like when you're collimating or doing a quick field repair. Awesome stuff, and very inexpensive, plus usually very easy to find. You could probably even get your hands on it a local "dollar store" on the cheap, and they're re-usable! Can't go wrong!

Best of luck, keep us posted!