My daughter is developmentally delayed and autistic, which is very sad, yet at the same time there are many joys. She loves coloring, even as a teenager she has a very large box of coloring books of many types. She loves crayons, especially the new scented crayons; these are crayons that leave behind a scent after you color with them. They have some really good scents such as roses and linen, but most of them smell, well yucky, to me. They have scents such as dirty sneakers, wet dog, and other unusual scents.
Kids, however, witness and perceive everything, and are always eager to let their knowledge flow to others through various means, verbal and non-verbal. While the verbal means are also important, the non-verbal ones are much more fun-oriented. These include various kinds of coloring books and, talking about the new generation, free printable coloring pages from the internet.
I then did research on the values of coloring for an adult. I found that my kids were right. Coloring is indeed a stress buster. It breaks the circuit of our over-loaded brains filled with never-ending thoughts. I found out that coloring quiets your mind as you focus on your masterpiece.