Cross processing color film is a fun and unpredictable process that can offer very colorful and dynamic results. You could probably achieve something similar in photoshop, but without the experience of shooting and experimenting using your technical photographic skills.
These are some informative links on the effects using certain types and brands of film. There are also some exposure compensations to consider in the process of exposing different types of film. Now, with the access to high quality film scanners, it is possible to produce beautiful abnormal colored images. Try it, you'll love it!