Sorry if this is too /r/'ish, but are there any "flipped" wallpapers out there, such as 1024x1280 (rather than 1280x1024). The deal is, i've flipped one of my monitors over to see how it'll feel, and so far i'm liking it.. gives it more of a "paper" feel for reading news sites and the like. (pic related - it's a screen shot of the 2nd monitor with an Ultra-Mon task bar). As you can see though, by default it stretches stuff around. Of course i could photoshop up some stuff, but why do that when it's possible there are artsy people out there who have already made kick ass wallpapers?
Here. A special edit of one of my wallpapers that I made for the occasional rotating of my monitor. It's 1200x1600, but I suppose it will look alright stretched down a bit.
I modified one of one wall I found a second ago, post anymore you want changed and I'll see if I can be bothered.
I think your best bet would be to take some super hi-res pictures and just cut the sides off it to your specifications.
Super-high-res? Perhaps this will work?