New today in the App Store is Nature Images, a free collection of 108 closeup nature photos for use as wallpapers for your iPhone or iPod touch. The press release says that these images have long been available on other platforms and are among the most popular wallpapers in the world. Once you select an image is selected, you tap a button to save it to your photo album. Then, as you likely know, you can use the Photos application to set it as a wallpaper (the app includes simple instructions). The photo you select will appear on your "unlock screen" and whenever you receive a call from someone without an associated image.