Open up your image in your favourite image editor (if its not photoshop, you close this thread). This is a tutorial I picked up at
http://caustic-media.com/sf/index.php but the touchups are mine
Step 1:
Duplicate the Background layer by clicking Layer>New >layer via copy or pressing Ctrl+J.
Step 2:
Select the newly created layer and hit Ctrl+U or Image>Adjustments>Hue/Saturation from the menu. This will bring up the Hue Saturation box. Make sure the "colourise" box is checked on the lower right and give the following inputs:
Hue: 38
Saturation: 22
Lightness: 5 to 8 (depending upon the lightness of your image)
Step 3:
Duplicate the layer you were working on (layer 1) and then select Filter>texture> Grain. Give values of:
Intensity: 100
Contrast: 5
Step 4:
change the blend mode of your layer 2 (the one with the filter>grain) to Multiply. After that, duplicate it to get layer 3.
Step 5:
Making sure layer 3 is selected (or the third layer that you created as it could be background copy 1, copy 2, etc) go to Filter>blur> motion blur.
Give values of
Angle: 90 degrees
Distance: 90
Step 6:
Change the blending mode for layer 3 or the layer you were working on to "soft light" in the layers pallette.
Step 7:
Touching up: use your Image>Adjustments>Brightness/Contrast dialog box to brighten your image if it is looking too dark.
Clouds: Create a new layer, select it, go to Filter>render>Clouds and then play with the blending modes to get some superb lighting effects. It works only on some images.
Here's my image:
