Hello,
The home page is meant to be different because of the overlaid Image and Content Fader. You can change the color below though for the background:
Template.CSS - Line 516
#s5_header_area1 {
background: rgba(0, 0, 0, 0) url("../images/s5_menu_bg.png") repeat scroll 0 0;
display: block;
height: 114px;
overflow: hidden;
width: 100%;
z-index: 3;
}