I think I could do that; from what I've seen so far, Fettuccine doesn't use much memory and almost no CPU. (Well, except when displaying an animated GIF file. I don't yet know why it runs the CPU so hard when on an animated GIF...)

But I'd think that shrinking these webcam images down even further would make things a bit hard to see. The widget would probably have to take up a lot of space to be useful, wouldn't it? (I suppose it'd be possible to vary the size...)