Blue evokes feelings of calmness and spirituality as well as security and trust. Seeing the color blue causes the body to create chemicals that are calming. It is no surprise that it’s the most favored of the colors. Dark blues are great for corporate designs because it helps give a professional feel, but using too much can create a cold, disengaged feeling. Light blues give a more relaxing, friendly feel. Great examples are social sites like Facebook and Twitter who use lighter blues.