Another BlenderGuru tutorial, you can find it here:
This tutorial was from guest author Chris Monson (http://www.photogenesisdesigns.com/gallery/stills.html).
Models, materials and textures are supplied - the exercise is lighting, particle systems and compositing.
As usual, I have veered off slightly and done something a little bit more my own.
Please view this large, the click-through has details that are lost here.
Comments are very welcome.