Temporary tattoos.
You can get a liquid from Charles H Fox (see page 24, which has a few different options):
http://www.charlesfox.co.uk/RETAIL_PRICE_LIST_2011.pdf I think the first option (Kryolan one) was what I used several years ago. I applied a fake heart tattoo with my name on the banner to my girlfriend's shoulder before she went to her firm's Christmas party. Apparently it made a great target for the water pistols that were put on the tables. And it didn't come off! (It did come off eventually, of course, just not from being sprayed with water.)
However, a slightly simpler option might be a temporary tattoo ink pad, such as the ones listed here:
http://www.stampin.com/online/accs/pads.htm#tattooThose pads seem hard to find in the UK (and I wouldn't recommend ordering from that site, as they use a very expensive courier service for international orders and that doesn't make sense). However, this site has something similar:
http://www.bakerross.co.uk/src/COMPARE/ ... ck-F80.htmBuy a set of repositionable stamp letters, and you can get nice bold letters every time (no need to buy a separate block, as you can use a CD case, but a suitable sized block might help). This alphabet is close to what you probably want in terms of size and font, but the letters are designed to look like they are aged/printed with potato-style stamps:
http://inkadinkado.eksuccessbrands.com/ ... habet.aspxYou will get the whole alphabet.
