A few months back, we started loosening up the requirements for what was and wasn't accepted into the public wallpaper gallery here at WinCustomize. A lot of wallpapers that wouldn't have previously made the cut, were let in, but some were still considered "below the line" and were rejected.
Going forward, we will no longer be rejecting Wallpaper submissions based on quality.
This however does not mean that everything submitted will be posted to the main public gallery. Moderator discretion will still be used, and anything that would have been previously rejected, will now be placed on the user's personal page only. This will allow people to store their work, have their own personal gallery, without it necessarily being placed in the larger public gallery.
Wallpapers however will still be rejected for issues of copyright and technical functionality (i.e. a 250 x 400px image still isn't a wallpaper).
This means that you may get an email saying your submission was accepted, but be unable to find it in the public gallery. You should still be able to find your work on your personal page.
Note: This doesn't cover the rating system, which can also impact the visibility of a submission.