If you want to properly calibrate it (colors, luminance, etc.) then you need to buy a hardware calibrating solution.
As per images that can help you calibrate by eye,
Calibration Image 1 (JPEG): http://legacycreative.gettyimages.com/en-us/marketing/services/Getty_Images_Test_Image.jpg
Calibration Image 1 (TIFF): http://legacycreative.gettyimages.com/en-us/marketing/services/Getty_Images_Test_Image.tif
Calibration Image 2 (JPEG): http://www.xmission.com/~inkjetcolo/JPEG.zip
Open these up in a color-calibrated program for best results.
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