I added an action set tonight that simulates the photographic effect of split toning. There are twelve different split tones.
The actions add very little overhead. They use Color Balance adjustment layers. You can adjust layer opacity or the Color Balance settings to adjust the effects.
You can even apply the effect to color images for an interesting effect.
Enjoy!
http://www.thelightsrightstudio.com/TLRSplitToning.htm
Cheers,
Mitch