I consider myself to be spastic when it comes to my computer's wallpaper.  I am constantly changing it from one image to another on almost a daily basis.  How do I constantly find awesome images, you ask?  Well, I find my images on Reddit, in a variety of "porn" subreddits.  "Porn" has a different meaning when on Reddit, it means something along the lines of "beautiful imagery."  You can find subreddits like 'EarthPorn,' or 'CityPorn,' or 'HistoryPorn.'  Each subreddit is full of hi-res images that work perfectly for wallpapers.

Imgur via Reddit

Imgur via Reddit

Imgur via Reddit

Imgur via Reddit

Imgur via Reddit

If you can't find the perfect wallpaper for your computer out of these thousands of constantly updated pictures, you're doing it wrong.