Thanks everyone for voting and the feedback! We have decided to go with Icon #2 for the game. We liked #2 and #6 equally, so don't be surprised to see a variation of #6 in one of our next games. #7 also had a strong showing as well. We have our own take on a "zombie chaos management" game getting close to being ready for a preview, so this may be a good type of icon for that game.
