This can be for (most) banners based on animation, whether they were used specifically for the animation forum or the main board, or whatever.
This one is based on The Secret Saturdays, obviously.
This one is based on Naruto Shippuden.
This was based on Star Wars: The Clone Wars.
This is Ty Lee, from Avatar: The Last Airbender. It's one of the banners I'm not so proud of, because objectification.
This is also from "Avatar: The Last Airbender". It's a map of the four nations, and I must have swiped the text from some official site or magazine or something, and just changed the caption to say "Volcano Mountain". I probably used it on the main page, but I'm not sure.
This is based on Futurama.
This was based on Samurai Jack.
Once again, this is based on "Avatar: The Last Airbender". I probably used it on the main page of the board (like a lot of the images on this page), but I don't remember. Anyway, it would have only been up for about a month.
Yet another "Avatar" banner, and again a very temporary one.