I decided to take the plunge and order some printable, self-adhesive vinyl sheets. A quick print out from my inkjet printer, some careful trimming et voila:
I bought the vinyl on eBay (just search '20 WHITE A4 INKJET SELF ADHESIVE STICKERS GLOSS PHOTO QUALITY VINYL COATED'). They claim to be waterproof and I got the white sheets, but they are also available in clear which may be better for some people.
I don't expect them to last indefinitely, but they're so easy to make that they can easily be replaced if necessary.
BTW, I do have a few spares which I am happy to send to TMers on receipt of a stamped addressed envelope - PM me if you're interested.
