I use openbox but programs are interchangeable.
feh - setting background image
xlock - part of the xlockmore package for a very lightweight screen lock.
adesklets - widgets embedded into the background for my system.
Here's some commands I use for launching them so you don't have to do too much research. I have the xlock command setup as a keyboard short cut [WindowsKey]+L which is the same on Windows.
Code:
xlock -mousemotion +description -mode blank -bg black -fg grey30 -font -adobe-helvetic
feh --bg-scale '/home/sam/Pictures/1024x600/one-piece-beach_1024x600.jpg'
It is best to crop images to your screen size using Gimp before using the feh command for best results.
Here's some screenshots of my setup using those utilities and some utilities which you've already mentioned.
http://img267.imageshack.us/img267/8...eenshot2ej.png
http://img697.imageshack.us/img697/9...eenshot2xk.png