If there's one thing most people agree on, it's that colouring is enjoyable and relaxing.
If you're looking to de-stress then pattern and mandalas are the popular choice.
Psychologist Carl Jung introduced the concept of colouring mandalas as a relaxation technique in the early 20th century.
Here's my round-up of 12 colouring books for adults featuring patterns...
Butterflies and Flowers
30 designs of different dimension of
butterflies and flowers.
Artful Eggs from Around the World
16 stained glass images of
elaborately ornamented eggs.