To print and color:
Crayola Web site 
Connect-the-dots Owl 
What's wrong with this picture?
Beaver Colour-by-Numbers
Clipart (for colouring and crafts) 

Cool Web Sites!
Yucky Kids
Grossology
Eco Kids
4 kids
Kids Domain
Atlas
Greenwing
Kidzopedia

Environmental Activities
Birdfeeder
Composter
Make recycled paper
Tree School