We can`t catalogue WebGobbler as a graphics editor, because it isn`t exactly that. WebGobbler would be something more like a "collage editor" as it automatically creates collages from images you indicate. The collages are random and always different. WebGobbler takes the indicated images and applies loads of effects (position changes, rotation, colour inversion...) to create the final composition. Logically WebGobbler lets you work with images from your hard drive, in addition to those that come as a default.
The collages created can be automatically established as wallpapers or screensavers.