The Bloom attaches to your bicycle like an exhaust, but instead of releasing CO2 it leaves a trail of bubbles. While this alone would make it cool enough to buy, it goes beyond the aesthetic and serves a (subversive) purpose.

Seeds are added to the bubble mixture, so when you ride your bike the seeds float into the cracks of the street and sidewalk. Over time, you will help green the edges of your city.

Cool idea.