What you'll need:
• Audacity.
• An image program that can save as TIFF such as Photoshop or Gimp
What to do:
•Convert the image to .tiff or .tif format in GIMP open it up in audacity by starting a new project and importing it as raw data (you HAVE to pick A-law as an option when importing).
• Play the track.
• Cool crackly noises.
Now let's make it look cool:
•Avoid modifying the beginning of the track, that's where the guttywats of the image are, and it wouldn't work without it being intact.
• Apply echo, reverb, wahwah, phaser, normalization, noise reduction, pretty much anything you want.
• Export as headerless raw data (you have to pick A-Law again when exporting).
• Erase .raw extension and replace it with .tif again.
• Open up the image
Notes:
•Image import goes from top to bottom, appears left to right in audacity.
• Complex colors/areas of the image have more noise.
• Don't edit the header!
• Creating more noise in the rendered audio file creates more color.
• Patches of silence appear as a small field of grey pixels in Photoshop.
• Simple waveforms appear in Photoshop almost as they do in Audacity.
1 min effort examples