Wallpaper resize?

[ZekkRagnos]

Can anyone make these wallpapers the correct size?
http://imgur.com/qrZkX7C,ZvbdzdC

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[sitlet]

That image is only 580x803. So there really isn't any easy way to resize it while keeping the aspect ratio. Plus, I would be blowing it up to nearly 3 times it's original size, so it will look awful.