Grab yourself something to color, because today is National Coloring Book Day ! It is recognized annually on August 2. Coloring and coloring books have always been popular with children, but over the years adults have gotten more and more involved with coloring. Adult coloring is now a huge trend and many are finding that it is not only fun but also a great way to reduce stress. Founded in 1941, Dover Publications led the way, releasing their first coloring book for adults, Antique Automobiles Coloring Book, in 1970.