I wanted an abstract wallpaper that related to the time of day, so i created these wallpapers using the GIMP, and i wrote a highly-customizable Winterboard script to blend the images slowly over the course of 24 hours.
Included in the package are a Wallpaper theme and a LockBackground theme for Winterboard. The only difference between the two is the name of the html file. You must have your iPhone/iPod Touch jailbroken and have Winterboard installed to use this theme. Otherwise, you can just use an individual image from the set as your wallpaper.
Edit: Added two more images to make the cycle correspond better to actual daylight
Yay, my first DD!
Edit #2: Fixed a silly typo in the html files
Edit #3: Improved the script, desaturated the 'twilight' phase, added a customized weather script