This is an idea I've heard suggested but had never seen anyone try to implement: environmentally-friendly events.
Most events are so wasteful (all those drink stirrers, those plastic cups and plates, and those conference lanyards, tote bags, etc.) that it seemed like an obvious idea.
From the site:
dvGreen designs sustainable events without sacrificing style. We show our clients that they can reduce their ecological footprint while still throwing a beautiful party - one that just happens to be Green. By featuring organic food, flowers, and table linens; tree-free paper invitations; donating or composting leftover food; purchasing carbon offsets, and more, dvGreen creates incredible events that you can be proud of forever.