ok i dont know for you but im using 1280x1024 on my desktop and there is lot of "cool" wall in 1024x768 even in 800x600 its frustrating because if a stretch them to fit my screen they are loosing quality....
so its is possible for people even if your resolution is smaller to do your wall in 1280x1024 or 1600x1200??
its your decision but im sure my not the only one with this probleme
thx all :)