Hi This is my concept...I use a bright color to get the 'fun' impact, but I can change it later if you think it is too bright. Using your basic concept, I make the 5 combinations of color that blend each other. Also make icon of 2 people talking in the 'o' words to represent the communications.
I'm not afraid of bright colors so that's OK. But, it looks a little too much like a color wheel that you might find in art class. Not crazy about the graphic treatment of the 'o's in scoop.