Actually I have TWO coloring books for grown ups coming out (should be in all the normal spots for purchase next week some time),
The first one had scenes from the wild, the second, has mind-twisting patterns of fishes, whales, etc.
so now there is

Of Oceans and Rivers, Fishes and Whales: A Coloring Book of Marine Life for Grown-ups and other Children
ISBN-13: 978-1523855735, ISBN-10: 1523855738



and

Of Oceans and Rivers, Fishes and Whales II: A Coloring Book of Marine Life Patterns for Grown-ups and Others
ISBN-13: 978-1523972524, ISBN-10: 1523972521


both are very G-rated, though a younger kid would be frustrated by the complexity of the drawings.

My wife pointed out that the Adult Coloring Books her friends have are largely meditation patterns, thus the second book. I took it as a personal challenge to make new and odd patterns, using some of the converted drawings and some new drawings.

Enjoy, Tight lines and Calm Seas,
Bryce