First things first, of course, not all Jodhpur is painted blue, only the old town area near the Mehrangarh Fort has buildings mainly painted in blue hues. Standing atop the Mehrangarh Fort and gazing at the blue-patterned houses is a delight for the eyes and a great photo opportunity.
Legend has it that the color blue is associated with Lord Shiva, who during the time of Samudra Manthan (also, known as Churning of the Ocean Milk) gulped down vicious poison called Halahala, in order to save the planet. This venom turned his body blue, and since then, his followers consider it to be a sacred color. Owing to its sacredness, many of his followers who were settled in the region daubed their houses in blue hues, thus the town received the moniker, Blue City.
Yet another belief is that the blue color is a determinant of social status. This story goes back centuries when the Hindu caste system was considered to be the basis for determining social status. According to the local lore, the Brahmin community (the priestly caste of India) painted their houses blue in order to differentiate themselves from the lower-caste communities, and since that time, blue is linked with the Brahmins. You might well hear these buildings referred to as Brahmin houses.

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