Profane Observations of the color combination Blue & Yellow.
Once you see it, you can never unsee it.
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Let's begin.

Blue print, blueprint
A detailed plan

Blue &Yellow are primary colors
Blue Degrees, Blue Lodge
South = Blue
West = Yellow
Blue = Dawn
Yellow = twilight
Blue = Water
Yellow or gold?
blue mist veils the sunrise in dawn.
blue eyes, blonde hair
green = blue + yellow
Spirit of man = blue , mind = yellow
Heaven = blue, earth = yellow
Blue is the true color of the sun, orange-yellow is the illusion
aquarius, house of saturn, blue and yellow
Blue = Sol
Yellow = Mi
blue auric Envelope steam or vapor
Yellow Buddhi, or spiritual soul Water
Lion's Mane/Corona is Yellow

This can go on and on, Most of this information is plucked from it's context. It's not meant to be a guide, Just show significance to these two colors from ancient times.

Here is a fun example count the number of times you see Blue & Yellow in the movie happy gilmore

Here are only a few examples

Getting bored of making these examples,

another comedy. perhaps colors are used to mock the profane and msg the illuminated.

Here is another example that may spike some people's interest.

The Ukraine Flag, Coincidence or Esoteric Symbol?

How about the European Union flag...