There are great works around the web using this awesome technique called matte painting. If you want to improve your skills on this, take a look to the following tutorials and try to complete them.
Tutorials | Matte Painting Roundup
About the Author: Carlos Pinho
A father, a husband and a geek... Carlos was the founder of projects like The Tech Labs and Flash Enabled Blog. He is the founder of TekTuts He is passionate about technologies. Their main skills are in analytics, transport & logistics, business administration. He also writes about programming resources, trends, strategy and web development.