It's helping me to spot things about them. Most of them are quite compressed but some aren't/look tampered with. I think some NT/Server Edition stuff is missing. I had two duplicates which I think were misnamed wallpapers out of Windows XP Plus Pack ("Stream" up there is actually "Nature_2").

I have these others that I think were definitely in windows, but I think they were Windows ME sample pictures or something. You could help to identify where they're from.