There are more than a hundred ideas and techniques featured by different artists. There are doodles, collages, intricate pieces, realistic ones, illustrations and many more.
I'm honored to be featured twice on the book with two different techniques!
Background and Space (pages 18 and 19)
Digital Manipulation (pages 48 and 49)
You can purchase the book here
Here's a good review of the book by Parka Blogs