Desktop Blurrifier exists for one reason: to make your desktop pictures blurry so you can see your icons easier! And it keeps you focussed on work with less "desktop distraction". Everyone keeps a bunch of icons on their desktop, and it’s a lot easier to see what they are if your desktop picture isn’t noisy, busy, or complex. A slightly blurry desktop makes icons pop out.

Desktop Blurrifier lets you apply a gaussian blur to an image and then set it to the desktop.
Additionally, you can:
Scale the image up or down
Adjust the saturation
Change the exposure (lightness/darkness)
Colorize to be monochrome
Set a background color for transparent images
Adjust the image position

You can use EPS or PDF graphics (like a logo or art file) too.