I've been messing around with branding colors this week and wanted to share with you a nice reference.
So here it is...a quick psychology of color and company branding by Fast Company. As your students make art pieces, new products, advertisements and other graphic elements I suggest you show them this information and then have them pick specific colors and explain why they did so (e.g. audience, theme, personal interest, history, etc.); it could lead to some interesting discussions and enrich your students approach to playing with paints.