I want water transfer decals, I am actually thinking of making some small silk screens for the common stuff on all the machines, looks pretty east, print it out on film, rinse it off and mount it on a frame.
We did some silk screen printing in graphic arts back in high school...
You could take a picture of the design that you wanted, then process it in the film room (They had a black room back then...) and then take the negative and burn the image into a film with a very bright light machine.... then use that film on a silk screen to make your image... We did some printing on 12 x 12 mirrors...