Well, for me, colors really depend on power and/or personality. Or both. For Example, Ace's color is only based on his power (I associate Mana with Cyan, but the closest i have is light blue) while Grace's color is based on her power (Space) AND her personality (Sweet, Girl-ish)
thanks for the tips, and also i think i will need help on finding her anothers color for 1) this power (telekinetic/psychic) and 2) this personnality (calm,sweet,nice,handfull or a cross beetween amy and blaze)
EDIT:thats why i recolor the bracelet light blue and make this color purple.