Boys, boys, silly boys... they're just jpegs. No need for jealousy and histrionics. Download them if you want to. They might not "fit" conventional PC screen dimensions, but they are just graphics, people. Five of them are virtually identical to desktop images which already ship with Macs. They aren't anything fantastic.
(If you want the "animated" ones, you'll need a compression tool that opens .sit files and a screensaver or desktop slideshow app to flip through them.)
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