You can get transparency film that works with inkjet printers. It's pretty thick, though, and takes a lot of clear to build up over it. If you use it you have to be careful to keep the ink from running (a few mist coats of shellac did it for me, plus I was careful not to move it around once it was on), and (as always) try it on scrap first.
true, but you said they were thick and im not sure if i want that much clear coat....