im doing it like this : I'm making a Texture (256x256) name it to its color and the weapon/vehicle name (lets say... SonicDollBlue.png) than i save it into blockland/add-ons/shapes
in milka shape making a new material, rename it to what the file name it is and open the file.... than you need to select the parts you want to have colored (or textured) and press Assign... when this dosent work my name is Mr. Fail.