What about clipping them to some 1/4 perspex emulsion side up and puttingthem on carseat to take home
I had to look up Perspex and now realize that it's one of several names for the stuff I've always called Plexiglass. (Whatever did we do before Wikipedia?...) But that sounds like a good idea, especially if I could find some of the frosted Plexi/Perspex.
If you can't find frosted plastic, check out the fluorescent light diffuser panels at the nearest builder's supply (the kind that go into 2x4 foot ceiling fixtures). I think that you could safely lay a negative face up on a piece of one (they can be scribed and cut just like glass) and even use spacers to stack several in a lidded storage tub for transport. When you get home, spritz with Photo-Flo and hang as usual in the shower stall.