Ed Helper Printable Bookmarks:
At EdHelper, they have a good collection of bookmarks that you can print for students to color. The ones on the list with a (b&w) after the name are the ones for coloring. Illustrations include cats and dogs; gingerbread; dinosaurs, endangered animals, and holidays.
Scholastic Printable Bookmarks:
If you subscribe to Scholastic Printables (you can use Scholastic Dollars from your book fair), you can print the months of the year and other designs for students to color, for a reasonable subscription price. Here's an example of the stationery toppers I print and copy to use as bookmarks.
Activity Village Bookmarks:
Activity Village, in the UK, has plenty of printable bookmarks to color, including seasons, holidays, and monsters.
Printable Magnet Bookmarks from Wild Olive
We Wilsons Blogspot includes "nose in a book" bookmarks!
Stripey Print and Color Bookmarks
Winter Fun Color-in Jokes Bookmarks
Now, what printable bookmarks have YOU found?