These lovely outlines - of a bird and butterfly - are excellent for doodling around! Younger children could choose one pattern for the inside and another for the background, while older kids can sub-divide the shapes and get as intricate as they like.
Doodle Pattern Tiles - Creatures 1
These are my two favourite Doodle Pattern Tiles! I've seen some really fun designs done with the owl in particular. Kids can fill in each section of the design with their choice of doodle or pattern, using black and white pen or a mixture of colours.