Guests at Little Frog's birthday party include the red fox, the purple butterfly, the orange cat, and other colorful animals. The illustrations are designed to demonstrate the concept of complementary colors.
Arthur's birthday unluckily falls on the same day as his friend's, and he worries no one will show up at his own party until a solution occurs to him in the nick of time.
When returning from picking out decorations for her birthday party, Angelina accidentally damages her old bicycle beyond repair and soon begins doing odd jobs to earn money for a new one.
Little Miss Contrary always says and does the opposite of what she means, and creates plenty of confusion when Mr. Happy invites her to meet his friends at his birthday party.