7. Supposed to be celebrating: 20th Anniversary of the Nintendo Entertainment System. Reason for rejection: Severe complaints by the Pet Duck Association.
8. Supposed to be celebrating: The 65th Birthday of Googol, a 1 with 100 zeroes. Reason for rejection: Too geeky.
9. Supposed to be celebrating: This was one of two drafts to honor M.C. Escher. Reason for rejection: Too creepy.
10. Supposed to be celebrating: Two decades of the JPEG image compression algorithm. Reason for rejection: Compression too lossy.