Blue is not a liturgical color.
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I’m not Jewish and I’m not sure about current liturgies or the colors they employ. But I do know a special blue was by ancient Jews.
The Tzitzit is a fringe on the four corners of Jewish prayer shawls. These fringes had to use a color that was highly prized in ancient times. This blue color is called Tekheklet and its origin is disputed in some Jewish circles yet today.
I only know about this by having watched a documentary like show on the subject. I would think with it’s Old Testament history, the blue would get used somewhere in one of today’s religions?
Leviticus. Blue and purple were woven into the curtain of the Holy One.
Purple signified ROYALTY, the HEADSHIP of God over His people. Once the heresy of Mariolotry crept into Rome, they adopted blue as Her (sic) color and placed it into the liturgy to signify the new found significance.