Hey, I love to play reach i didn't really play Halo, and Halo 2 but i do know that the phantoms in those games are kind of turkoise (excuse my spelling) and the halo reach phantom turns that colour when there is light shining on it when it is dark it turns back to purple For example in flatgrass if you spawn a phantom under the little bridge thing it turns ti the original colour but when it's out on the grass it turns turkoise