another lightbulb went on: for keyboard sock, something else that would prolly work really well: leg warmers.
Look at the different types and sizes available (different materials too, from wool to spandex). Just about the right size. Tie off one end, optionally (tho the styles with elastic on both ends prolly wont need that either).
So iMav, any way you could have geekhack logo'ed leg warmers produced? (some folks might even use them on their legs, lol).
I havent tried out this idea yet but it seems like a no-brainer. There's also such a thing as "arm warmers" which might work if need a smaller size. There's also something called "baby leg warmers" again if need smaller size.
Unlike book covers (which are great as "dust covers" while boards are in storage but have no padding), leg warmers (wool or knitted) would actually provide some padding.