Bigger and better?

I have just got a new display for my computer, a deliciously big, high res LCD panel. And there's just one problem, a problem I didn't anticipate. My pictures don't look nearly as good on it. It's the resolution. At 1024x768, my old resolution, it's easy to find a nice looking desktop, for instance. But there isn't much available at 1920x1200, and the old stuff just doesn't look very good blown up to fill the new screen. So, gentle reader, be warned, your new display might very well make your old pictures look terrible, which might not be quite why you bought it.