This site has information on tons of different artists.  http://www.greatnaturalexpressions.com/

Here is a site with a variety of different lesson plans.

http://www.princetonol.com/groups/iad/lessons/elem/elemlessons.html

This one has all kinds of crafts.

http://www.allcrafts.net/

This one you can pick the type of median or subject  you like to use and they will show a variety of different projects.

http://www.crayola.com