Edupics.com is an excellent site with a huge variety of coloring pages, pictures, photographs and handicrafts.

It also includes an excellent online coloring section using My Coloring Book, and also makes good use of the User Gallery add-on.

Edupics also has a really neat coloring page designer, that lets you build your own coloring page.

ColoringPages4U.com has over 300 free online coloring pages for you to enjoy.

Coloring pages are grouped together by topic, and there is also a handy search function. There are lots of topics to choose from like Cats, Dogs, Mothers Day, Easter, Christmas, SpongeBob, Hello Kitty, and many more besides.

The site also uses the User Gallery and Post to Facebook add-ons.

Light Sleepers is a small independent crew of multimedia artists, making animated storybooks for iPhone and iPad, with an effort to create high-quality entertainment for children that is beautiful, innocent and sweet.

Their website now features free coloring pages from the storybooks, both printable and online.

Ask A Biologist is designed as an educational resource for students preK-12, and their teachers and parents.

There is a great selection of interactive coloring pages and worksheets on all sorts of biology topics, such as anatomy, ecosystems, plant life, and animals.