I have been wondering, after a while of this sight being up, and a lot of great works making it into the permenant galleries, what's gonna happen when the galleries end up filling up with more than like 300 images in each category or sub-category, the images in the middle and towards the end are going to become lost images, it'll also be hard for members/visitors to find wallpaper that they'll like.
One thing that I've done is to have the galleries sorted randomly by default. This means that the casual visitor is equally likely to see any specific image on the first page. We also go through the "permanent" gallery every so often and remove the less popular and over represented images. In this way the galleries will continualy increase in quality. As long as we continue to only accept the best of the best I don't see how there could be a problem finding wallpaper that you like.
Whether the galleries get larger just depends on how much deleting we do. If all the images are of high quality I have no problem with the galleries getting twice as large as they are now.