answer:As long as there aren’t any images which they would find offensive, I don’t see why they wouldn’t allow it. The app store already has a plethora of free wallpaper apps, so why not yours as well? If you’re expecting to charge and make any significant amount of money from it, you’ll most likely be very disappointed since they’re already flooded with free ones. Your pics would have to be truly exceptionally fantastic for most people to be willing to pay any amount at all. I know that I wouldn’t buy a wallpaper app, even as low as 99 cents, since I already have several free apps which offer hundreds, even thousands of images. They are also updated with new images from time to time. But if you just want exposure for your photography, then go for it. You might even sell prints of your pics as several other photagraphers do thru their free wallpaper apps.