One of my favorite sites is Dover Publications. They make thin books filled with coloring pages, poetry, puzzles, clip art, craft projects and other activities.
Get free downloads of pages from some of their books to use in teaching. Kids love ‘em (and so do some adults).
I recommend saving the pages you want to your hard drive even after you have printed. This is because Dover keeps the pages on the Internet for a week or so then its gone.
Here is the link to get the free samples pages delivered to your email inbox. Dover Free Sample sign up page.