diy rub-ons?

[lavinia-short.livejournal.com]

(get your minds out of the gutters, kids, this is a clean post!)

does anyone here know if it's possible to make your own rub-on letters or images? i was thinking maybe something with waxed paper would work? but i have no idea! i have some images that i'd love to turn into rub-ons, but i don't have a clue how to do it...

and, transparencies - kinko's can make these, right? can they do them in any color?