From one of my favorite design websites, SwissMiss --
Inkjet tattoo paper 
Tattoo yourself - or the kids - with no pain and the added bonus of being able to scrub it off with hot soapy water. These decal papers enable you to use your inkjet printer to print 'tattoos' that look just like the real thing - from your own customised designs. They take minutes to do and, if left unscrubbed, will last up to a week. Why not ring the changes and create different tattoos for different occasions?
The tattoo sheets come in twos: one printable A4 sheet and one adhesive film. The process is quick and easy as well as painless (even if you have sensitive skin, as the 'tattoos' are water-based and non-toxic.) See the step-by-step guide for precise directions or download the instructions sheet. First print your tattoo onto the printable sheet (remembering to reverse your image/text - your computer will enable you to do this). Then transfer the image onto the adhesive sheet and apply it to the skin. Peel off the adhesive film - and it's done.
Here's a US reseller.
