Johanna Basford's intricate hand-drawn coloring books for adults have sold nearly 1.5 million copies worldwide. Courtesy of Johanna Basford/Laurence King Adulthood seems to be having a regressive ...

We rounded up the best adult coloring books that you can buy on Amazon for less than $15. ... Garden and Forest Coloring Book ... Ocean Scene: Coloring Book for Adults $7.99 ...