Two bicycle-related stories, the one whimsical and possibly of little use (except it would make kids of all ages smile,) and the other useful in a why-didn't-they-think-of-that-sooner kind of way.
From Autoblog this about an attachment to your bike that...wait for it...blows exhaust-like bubbles, thereby showing up the carbon-spewing monsters who share the road with you. It also has the odd notation that it "spews seeds," if you can figure out why, let me know. To those who object, the seeds are optional.
Have a desire to spread more than just good will the next time you're out on your bike? Consider the Bloom attachment for your two-wheeled conveyance of choice. While it may look like an odd exhaust pipe hanging off the back of your engine-less bicycle, it's actually a way to seed the city as you ride. That's right, the Bloom gets filled with some soapy water (see, it's clean!) and some seeds, and as you ride, the incoming rush of air powers a "bubble pinwheel" which dispenses the seed-filled bubbles everywhere you go
[Image from Autoblog]
Also from Design 21's competition, the II place winner, a folding handlebar: This sounds like it could make it to production.
The design of the handlebars allows the effective storage width of a standard bicycle to be dramatically reduced. In addition the handlebars, in their folded position, form a steering lock, when the bike is lent against a wall or post this steering lock eliminate the infuriating turning of the front wheel. The steering lock also provides additional security when parked outside.
[Image from Design 21]