If you're going to stare at a screen all day, it may as well have something decent on it.  I like computer generated artwork, usually landscapes and planetscapes, and these are my favourite artists:

All of these sites provide a gallery of free wallpapers, some also have a member's only gallery for those who pay a subscription.  Digital Blasphemy is well worth the subscription fee, and the user gallery there is very high quality.  To me the CG artwork is just as "arty" as the pen and paper stuff.

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