Sometimes all you want to do is color inside the lines.
2016 Coloring Calendar: An Adult Coloring Calendar by Jenean Morrison
Get a copy here.
Test Pattern Press
Four Seasons: A Coloring Book by Aiko Fukawa
Get a copy here.
St. Martin's Griffin
Just Add Color: Folk Art by Lisa Congdon
Get a copy here.
Rockport Publishers
You Got This: A Mantra Coloring Book by Katie Daugherty and Sarah Pierce
Get a copy here.
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22 Coloring Books That Will Calm You The Heck Down