I believe that sunflowers equal smiles. They take you away to a fun sunshiny place. They make you feel warm and fuzzy inside. They mean sunny days, water sprinklers, iced-lemonade, and the smell of freshly cut grass. Sunflowers just make you happy; that is, of course, unless you are crazy. Although, crazy people probably like sunflowers too.
Just for fun: Step by Step Guide for growing sunflowers.