Here's a link to an article by Pam Dyer at SocialMedia Today about the use of color in marketing. It includes two excellent infographics from the Logo Company and Kissmetrics depicting how color affects consumers and how marketers can more effective use color in branding.
Dyer also quotes statistics that show that color:
Increases brand recognition by up to 80%
Improves readership as much as 40%
Increases comprehension by 73%
Can be up to 85% of the reason people decide to buy
Something to think about when creating posters, handouts, bookmarks, and bibliographies in the library -- the colors we choose can affect how receptive people are to our messages.