Not sure why you posted this here but...Bill, I'm not sure what you mean special effects with xray film other than it will render yellows and reds as very dark grays to black. I use the green sensitive type and quite like it. I contact print to make carbon transfer prints, so I don't care about it having emulsion on both sides. Prints still look quite sharp to me. I certainly wouldn't enlarge it but some people strip the emulsion from the backside of the film before doing so.
This film with a light yellow filter (#8 kodak wratten) will seperate clouds from blue sky, but of course not as dramatically as you can with a red filter on pan film. A red filter will result in a clear sheet of xray film. I sometimes use a green #57 to slightly lighten foliage.
Why not photograph a pretty girl with xray film?? I've seen some lovely portraits taken with it (not in person, mind you).
It's cheap. Try it.