Last time Platdude tried this, his head was full of bruises.

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Wallpaper Click for 1920x1080 HD wallpaper.
Download Them All Over a thousand HD 1920x1080 wallpapers in one giant bundle.

Download is updated frequently, so should contain almost all the desktops.
Each desktop image is 1920x1080, but since they're all made of blown-up pixelart, they're usually quite small in filesize.
At last count, the download was just over 20Mb, which is a lovely size when you consider there's over 1000 desktop images in there.

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Calendar Why not print yourself a calendar?!