Whoever says that coloring books are only for children probably have never seen the work of Johanna Basford, a UK-based illustrator and ink evangelist who make such books come true. I stumbled upon her work via Bored Panda and oh, how I wish I can find the books in the nearest bookstore.
Here are some images
I'll be prowling Amazon and praying for the day when Indonesia can click the payment button.
Check out her website, Facebook and Twitter