Classic is a sky aqua blue because this area can reflect light back into the house best when it is light in tone. Also, when you sit under it, it is as charming as sky. The eave can be dark, and the rafters can be dark, but I think you will like having contrast here - like http://www.sherwin-williams.com/homeowners/color/find-and-explore-colors/paint-colors-by-family/SW6477-tidewater/ this would make your hardieboard wood look very rich.