In the photography by using different combinations of chemicals, one will achieve a split color effect that makes the shadow tones one color and the highlights another. This Photoshop actions will simulate a simillar effect on your digital images.

Enjoy!

Free for personal use, for commercial please do ask! Thank you!
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How to install the action:
1. Put the .ATN file from the zip in a directory of your choice. It does not need to be in the Photoshop directory.
2. Choose Load Actions from the Actions palette menu.
3. Select the action set file from die directory you saved it.
4. Click Load.
5. Play it.

Have fun!
JennyW.

TIP! If you want to see all the steps in the action and learn something (actions are great learning tools), check the "step by step" or "pause for XXX sec" on the playback options. Commands within an action can be also toggled on or off, giving you the option to play each command or bypass recorded commands within the action during playback.

Photocredit: [link]