I have found a really cool website quite by accident when i was looking for ways to add depth to the colour in my photos. I had gone out to Eastham with Chris to photograph autumn colours and i didnt use a polarizing filter. The website below had a tutorial which worked really well and i also had a go at the cross processing too.
http://www.bernskiold.com/2011/07/22/mimicking-polarizing-filter-effect-photoshop/#more-3172
http://www.bernskiold.com/2011/07/06/faking-cross-processing-photoshop/#more-3144
Here are a few samples of the cross processing, it was fun!
Photographing the Beautiful Wirral Landscape and Coast. www.spikeymousephotography.com
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