Here they are: the totally inofficial #RheinMainRocks sticker.
They'll start showing up in the RheinMain area in the coming days. Our awesome backers will receive them on the Google I/O extended in May and the WMFRA in June accompanied by a little gift I was able to add to the package because … #RheinMainRocks!
There is a flickr album which shows them in all their glory.
The backers will receive a complimentary sheet with a different color version and smaller versions.
For instance, the smaller version can be used to cover your camera: