Blue is often associated with sadness in the English language. Blue is also used extensively to represent calmness and responsibility. Light blues can be refreshing and friendly. Dark blues are more strong and reliable. Blue is also associated with peace, and has spiritual and religious connotations in many cultures and traditions (for example, the Virgin Mary is generally depicted wearing blue robes).
The meaning of blue is widely affected depending on the exact shade and hue. In design, the exact shade of blue you select will have a huge impact on how your designs are perceived. Light blues are often relaxed and calming. Bright blues can be energizing and refreshing. Dark blues are excellent for corporate sites or designs where strength and reliability are important.