Here’s a good tutorial written by Blane for Photoshop CS4. In it he shows you how to create an interesting montage.
Photoshop Montage Tutorial (5 MB)
A Message from Blane:
Learn how to create a mysterious tree house in the forest using manipulation techniques in Photoshop. This tutorial focuses mainly on lighting effects. Learn how to give the appearance of nighttime, give off a glow of light, and add shadows. Gradients, clipping masks, downloading brushes, and blending modes will also be covered. Overall this is an easy tutorial that is great for beginners to learn basic tools of photo manipulation. I hope you enjoy it! Let’s begin!