Well, to me...#1 kinda looks like tungsten film shot in daylight, but it's more likely to be slide film cross-processed, and color-corrected when printed. Usually I see strong, solid areas of cyan...(like in the left of photo 1), and an overall greenish tint. Shots 2 and 3 DEFINATELY look like cross-processed slide film (you can tell by the very high contrast, and blown out highlights on their foreheads etc). X-processed negative films turn out as slides...lower-contrast, and often bluish.
The problem with cross-processing is that the results are very different depending on the brand/type of film you are using. See this link:
http://webmonkey.wired.com/webmonkey/99/23/index3a_page4.html?tw=design
#4 (and maybe #3 also) could be just a very high contrast and highly saturated film like Agfa Ultra. Try that Agfa film out, I can assure you, that you will get results like that. In harsh daylight, it has a tendency to totally blackout shadow areas. I especially like the look of it with daylight flash on the subject, and flourescent lighting in the background (emphasizes the lime-green color) .
Just do an engine search (keywords: "cross processing"), and you'll see plenty of images similar to these. You might also be interested in this webpage: (
http://www.quarlo.com) Lots of examples of cross-processed images (in the archive).
