Morovir, using your same methods, can you also do that with Westly's http://planetelderscrolls.gamespy.com/View.php?view=mods.detail&id=6825? Like, ya know, make them 4096x4096 or 8192x8192 or whatever.
You can, but at a certain point, you will end up with the too much blur at normal resolutions. Even with the best upscaling algo, you get blurring. As such, you really want to stay as close as possible to the native resolution of the source material.
I had to do some restoration work to get them to look good at the resolution I'm using. I was primarily interested in implementing race specific bodily features, and I was starting from high-res sources.
Also, beyond about 2048x2048, you really don't notice the different - but you sure as heck do notice the fps loss in crowded rooms.