blue symbolizes God's glory in Judaism
Nazar charms are commonly used as amulets (folk religious artifacts) in the Near East to protect against the evil eye.
In Buddhism, blue (lapis lazuli) is a color representing healing and purity.
Virgin Mary and Christ are often depicted in blue for various theological reasons. First, as blue represents God's glory in Judaism, Mary wears it as a symbol of her carrying Christ and her own immaculate conception. The cloth covering the Ark of the Covenant was also blue, so Mary (the "New Ark" carrying Jesus) is appropriately covered in blue cloth. Finally, this type of blue cloak represented an empress in the Byzantine Empire, which is where most of today's iconography has its roots.
Several Hindu avatars are depicted with blue skin. Apparently, Krishna (pictured above) is represented with blue skin because he drank the poison intended by the demons to kill humanity thus impairing his normal breathing mechanisms and turning his skin blue.
While Islam is typically represented by green as it is generally accepted as the color of holiness and paradise, blue is frequently used in Turkey, Central Asia, and Iran as a symbol of purity and protection.
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