Need to change it? No. Should you change it? Thats entirely up to you. Though, don't let what has come before stifle your creativity or make you change something you don't want to.
For reference, Incarnum has a really big thing for the color blue. Azure, Cerulean, Indigo, Sapphire. All used in the names of feats, the latter of which is also included in a PrC name. Hell, the Incarnum Humans have blue tinted eyes, the lawful incarnum race has blue spines on their arms and legs, the chaotic incarnum race has blue (or sometimes red) scales on their necks and forearms, and the incarnum fey has blue skin and fur. Everything is blue.