>>/7759/
https://www.ponychan.net/site/res/17893.html
> Since we're no longer going to be an explicitly MLP dedicated site (not that we've really been much of one for a while now), we're going to retire a bunch/most of our banners, which means we're going to need some new ones. If you're artistically inclined (or at least feel like contributing in general)\

First guess, off the top of my head is that having two sets of banners isn't easy or possible to set up in tinyboard (or whatever they use) in the same way that themes can be switched around. 

Thanks for the notice. I will be monitoring the thread  and perhaps leave a post or two there myself