Positioning and Branding
The British Museum shares their design guidelines (PDF, 28 pages).
Creation in Common
Creation in Common offers an article on how to set specific goals, reaffirm core messages, develop a new tag-line, and make color changes that strengthens an organization’s identity.
Florida Museum of Natural History
Florida Museum of Natural History shares one of their marketing kits and style guides. The document (PDF, 30 pages) provides guidance on logos, typography and the overall brand and materials for marketing, developing a press kit and education.