No real Hack Day without a logo and stickers. Thanks to Twitter we got several suggestions. I love them all (well, almost all ;) but could unfortunately, due to the Bonnier graphic design policy, only choose one of them. Still, I want to give all the designers credit by publishing the logos here:
The Winner

Christian Wilsson (@kribba)
The Rest

Johan Mogren @johanmogren)

Adam Gardefjord (@gardefjord)
And a (sligthly less serious) gift from our main competitor Schibsted:

Tobias Gärder (@tgarder)
Big thanks to all of you (and to Erika Jansson who also designed a logo)!
[UPDATE]
One more logo!

Benjamin Holfve (@trevald)