As you may or may not know, Fedora 8 introduced a nice feature in Gnome, called Infinity: changing the wallpaper image based on the current time. It was pretty nice to have a bright wallpaper at noon and a dark one at night. However, this feature wasn’t available for KDE as well so someone had to make it. And here it is.
To get an idea about how the wallpapers look at certain time of day, here are some screenshots. But there aren’t just four images. There’s one for each time of day so you’ll have a different background every hour.