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You can use ImageMagick to make blurry images.
To install with Homebrew on OS X.
brew install imagemagick
After installing you can run from the command line
convert yourimage.png -channel RGBA -blur 0x8 your-blurred-image.png
You can run this from your Ruby scripts with the back ticks.
`convert path/to/original-image.jpg -channel RGBA -blur 0x5 path/to/blurry-image.jpg`
Change the value for the "-blur 0x8" argument to increase/decrease they blur. For instance, "-blur 0x1" would be a lot less blurry.