This articular/tutorial is really cool and it teaches you how to add a cartoonist like depth to your poster. It teaches you how to add textures to your designs and how to give it a cool looking depth effect. I love this effect and will try and use it as much as I can. You could use this tutorial for many things. This i think is a really cool way to work with art you could make some really cool landscapes with this tool.
http://www.computerarts.co.uk/tutorials/add-depth-and-texture-illustrator. Here's the link hope it helps you.
