Coloring and Doodling
Crayola Coloring Pages
Assortment of printable pages for adults and kids
Faber-Castell Coloring Pages
Assortment of printable pages for adults
Inspirograph
Just like the real thing!
Silk
Make symmetrical (or asymmetrical) art
Snowflake Maker
Like a fine sculpture, the more you chip away, the better the end product.
A very brief tutorial at the beginning will get you started.
Includes instructions for creating actual paper snowflakes, too.
Origami
Origami for Everyone
Instructables' guides
The Spruce Crafts: Origami
Traditional and non-traditional origami designs to follow step-by-step