Ryan Maguire: The Ghost in the MP3
Completion requirements
Image Example 2. White, Pink, and Brown Noise - Lowest Possible Bit Rate MP3 (8kbps) by Ryan Maguire, from The Ghost in the MP3 project website
Ryan's project webpage theghostinthemp3.com with audio and image examples, and explanation of his process. Ryan also has them on Soundcloud if you want to focus on listening.
Click on Ryan Maguire: The Ghost in the MP3 to open the resource.