There is a thread in the Art forum for banner submission, however, I wouldn't mind leaving a thread open here allowing people to make suggestions for what they'd like to see in the rotation to keep the site interesting to visitors. Not everyone can make banners themselves. The site isn't just about anime and we want to reflect that by adding a mix. I might not be 100% in the know on what's popular at every given time. Feel free to suggest TV shows, movies, games and such that are current or upcoming and I'll see if I can find an image that is suitable for the rotation.