|Negative film processed in slide chemicals via crossprocessing.info|
|Photo by Chick Dastardly-JennR.Williams, via EpicEdits|
|Photo by Laurent Butre via The Darkroom|
If you want to check out more examples, check out any of these galleries:
Epic Edits: Ten Reasons to Love Cross Processed Film
The Darkroom: Cross Processing examples
The effect can also be simulated digitally with filters in Instagram in or with Photoshop. Here's a link to a Photoshop tutorial.
How can we use this as artists?
Traditional painters can use cross-processing as a jumping off point for exploring color schemes. One way is to use a strongly colored underpainting. The second example in this post of the guy riding the bike could be painted over an orange base color, leaving that color as the stand-in for all the light values. The scheme in the lower scene of the little kid on the Harley could be simulated with a green-red-yellow limited palette, taking care to bleach the lights, sink the darks, and vignette the edges.