This is a fun and quick art project for your kids to do: Take a Line for a Walk! :
What you need:
Colored pencils, crayons, etc.
Pass out the blank pieces of white paper, and colored pencils, (or crayons). The rule is you start at one corner of the page, and do not pick up your pencil until the entire page is covered. Your child can work in strait lines, or draw curves, whatever feels right. There is no right or wrong, you just can not pick up your pencil until you are done!