The tribal symbols - from top to bottom, an abstract one influenced by leaves, the second is a dying flower facing away from the viewer, the last being a heart (obviously)
All of them incorporate earth related colours such as the browns greens and blue, very organic colours and movement to try and convey the feeling of the cause and simplicity for easy legibility and understanding.
I used the brush tool for a more organic and natural feel because the cause is primarily based around organic and natural things... i think.. :)
Alright so those are my road signs, they are based around circles, i drew it with the brush and currently am not so sure how successful i was but i will most likely try again and post another one if i can make it better.