Designed specifically for Windows 8, TuneUp IncrediLock makes available about 400 images to choose from as Lock Screen wallpaper in the new OS.
Apart from this, the app can expand the functionality of this space beyond simply showing the time, through widgets. At the moment, only Sticky Notes (useful for reminders, to-do lists) is available, but the developer plans to add a calendar and a weather widget.
The app is absolutely free of charge and there are several image categories to choose from, for example, Animals, Around the Globe, Comic and Art, Nature, Technology. The resolution of the wallpapers is generally above 1280.
Mind that TuneUp IncrediLock replaces all the default Lock Screen images for Windows 8 and, in our case, the original wallpapers were not restored. You can get it from Windows Store, at this address.