This design is highly inspired by the song "Don't Stop (Color On The Walls)". It goes along with the band's similar approach to lyrics by seeming simple but having messages underneath it all.
The direction with the stop sign was to take something we are conditioned to seeing but by adding a word and changing the colors the meaning changes as well. It actually means go now and the words reinforce the new meaning. The use of the three guys walking not only shows the number of members in the band but they are also helping one another by holding hands towards a common goal. This is also the mission of Foster The Future.
The philosophy is that we should be going against what is conventional and setting out on our own path. When society tells you to stop you should keep going towards something you believe in. I'm sure this is a message that the band could get behind also.