aura

"aura" tool is a desktop (X root window) background setter, capable of:

• picking image randomly from specified paths;
• skipping too small images and images with too different aspect rate;
• rescaling it in a clever ways (crop solid margins, resize with cubic, then liquid rescale algorithm) to fit the desktop with as little quality loss as possible;
• labelling images (that is, rendering the label in the corner) using embedded tags;
• daemonizing to pick new image on a time-basis or when triggered (by SIGHUP or cli);
• keeping track of used images, blacklisting.

Intended usage is to point it to the path(s) with random image collection(s) and let it adjust any suitable ones to the current screen size. It has no gui and no capabilities to dowload images from anywhere.

More info and installation/usage instructions:
http://desktop-aura.sourceforge.net/