Your image reminds me of one the things which really annoys me, that you can't set different backgrounds for different
I'm actually running a screensaver across all 5 screens. I use DesktopFusion, the free version lets you set different desktops on each screen. The paid version lets you run the same screen saver on each screen or different screensavers on each screen.
I have that 32", but there is a reason it's 5' away from me. It's fucking hot. Don't get me wrong, the four screens put out a decent amount of heat, but not as much as the 32".