The main one is the name of the div tag used within your Code. Its the area I believe you want to change the background colour of on your website.
For the favicon just make sure whatever design you do the background is transparent.
Place this in your head tag for it to display in the browser address bar:
<link rel="icon" href="www.yourwebsite/myicon.ico" type="image/x-icon" />
<link rel="shortcut icon" href="wwwyouwebsite.com/myicon.ico" type="image/x-icon" />