I knew instantly that the poster related to the environment from the sight of grass. I think the grid method was a nice choice for this poster as well as the circular pattern.
The School of Visual Arts poster poster design layout typography
A Comprehensive Guide to Symbolism
Age And Gender Based Color Preferences | http://www.designmantic.com/blog/infographics/age-and-gender-based-color-preferences/
Colors Around The World
Why marketers choose certain colors
Because not everyone knows the difference between Windsor and Ladder Back.
Infographic: Using color psychology when designing logos