I am turning into my mother by popping into tchibo every now and again.
Anyway, Tchibo have some quite nice stripy rugs with waterproof backing which roll up and have a carry handle. I just bought one today for 4.99 or 4.oo - can't remember.
They had some other bits and pieces that might be useful for camping.
If anyone is mega-interested but doesn't have a Tchibo near them I will be happy to buy and post if you have paypal as I know tartan is hard to avoid in these matters.