- This is for the person doing the tattoos. It depends on how much money you want to spend. Go online and google temporary airbrush tattoos. You will need some temporary airbrush tattoo ink (probably just a small bottle of black for you), an airbrush, and airsource (compressor or a tank of air - a lot of the smaller units can be driven with a can of air you purchase from the office supply store). You'll probably want to make stencils of the tattoos, then just spray 'em on.
some caveats - if you do this you need to prep the skin: wipe down with alcohol to remove oil from the skin. Apply the stencil to the skin, you can just hand hold it in place. Paint the stencil on and voila you're done.
The tattoo will generally stay on about a week or two... but can be quickly removed with lotion or baby oil. A gentle scrub of the tatto with a cotton ball soaked in baby oil or lotion will get the tattoo off quickly.
You also might want to google to see if there is anyone in your area doing temporary airbrush tattoos, you might be able to just get them to help you out.