Hey Jojonas. I kind of like the colors myself. Very interesting shot. But, to control the WB, the easiest way is through ACR (Adobe Camera Raw), but I think you need CS3 or later for that. I think. Im not familiar with PS7. But with CS3, you can tell it to open all your files into ACR, which is the program that opens all NEFs automatically. It just launches automatically if you open a jpeg or tiff from Bridge. In that window are sliders and one of those sliders is Temp, which is the WB. You just shift it to warm up the photo. Plus there are color sliders on another tab in ACR which allow you to fine tune the hue, saturation and brightness of each color. Its pretty awesome. I couldnt live without it.
In PS7, Im guess you would have to create a hue/saturation adjustment layer and play around with the color that way? Not sure though.
I'm interested in seeing how others here do it because this cant be the only way.