There are lots of coloring pages on our site that will fit many party themes.  You can find those through the bithday themes section or through the coloring pages index.

On this page I'm only going to list "specific" birthday coloring pages (characters in party hats and birthday cakes... that sort of thing)

You can use the color posters to make decorated binders for school.

Blue's Clues Birthday Poster (color)   or   (B&W)

10 Dinosaur Birthday Coloring Pages

10 Teddy Bear Birthday Coloring Pages