When you throw color on Krsna and paint Him with your shades from the mind, He throws the same color back at you. Its reciprocation! Which means in whichever way you seek God, He shows you that swarup(form) alone. He is colorless and formless, yet for the sake of His devotee, He takes that form and color which His devotee seeks Him in! Dhuleti is a festival which tells you to color your mind with Him and be lost in Him just like a Gopi.
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