Desktop Managers
QuickChanger
"QuickChanger is a new skinnable way to change your desktop wallpaper. QC’s basic interface consists of three or five thumbnail images generated on the fly from the images in your wallpaper list. QC will now optionally store these generated thumbnails for quicker load times. Right now QC support the image formats BMP, JPG (JPEG), and GIF…"
Status: on hold (for a long time), but development might just resume.
Trigger
Free and fully skinnable wallpaper manager. Lets you categorize your walls in "Moods". Icon and wallpaper settings are picture specific and more.
Status: on hold.