That was fun: 1. 3. 5. 7. Edit: And just to scratch an itch, I thought I'd throw in a Frank Stella inspired version: x. 
2. 
4. 
6. 
8. 
I don't know where to start, but I will say that this one is the most communicative:
sounds_sound, these are incredible. We all decided that #8 is the next sticker. We just want to know if it can say hubski.com, and maybe stand out a tiny bit more. Also what does it look like if the directions are switched? b_b says that left is etymologically associated with evil. :) I would love to do #7, but we can't afford it.
Don't hide behind the Latin b_b. Say it how it feel :) Edit: It's a tricky one, because if we aren't evil, then the rest of the world must be.
Thanks mk. Number 7 isn't going anywhere, if you change your mind. I'll cook up a handful of the rebel, with different tweaks, and we'll go from there :)
Wow! So many great ideas. It's interesting seeing people approach something from different angles or iterate on a concept. I really like 7, it captures the coffee-house creative discussion this place tends to foster. Although, it may not be the best for a sticker.