I also want to change the header background color. Looked in the CSS but nothing jumped out at me. Tried making an image of the color I wanted to use, but that left white blocks on either side.
Ok guys I figured it out. It was actually quite easy. Took a few minutes before it came to me.
Login to your admin area. Then choose “Appearance” and then “Editor”. Scroll down until you get to the “Styles” on the right hand side. Click the “Style Sheet – style.css” link. Then find the following part (about 1/3 of the way down the document):
The “background-color:#cc0000;” is what I added. That’s a deep red. You can use any color you want there. If you don’t know the numbers for html colors just google “web colors” and you’ll find lots of examples. Be sure to hit the “update file” button when you’re done.