Unfortunately, when it comes to sharing digital music with friends, there aren't too many eco-friendly portable speaker options available for the discerning green consumer. When such things do make an appearance, they tend to be acoustic docks made from materials like bamboo (think iBamboo) that simply boost the source audio in a similar way to using an old-fashioned horn speaker, or otherwise get their power from renewable resources (as with the SoliCharger or Rukus, for instance). The Pulpop MP3 speaker designed by Balance Wu and Chin Yang takes a slight diversion from such norms. It's made from recycled paper pulp and uses of vibration speaker technology to amplify the source audio through the surface on which it stands and the hollow space inside the doughnut.
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