REPLACE BACKGROUND
There are a few ways to put your own custom picture in the background of a RapidWeaver theme.
Edit background with Image editor

You can edit the background with any external image editor (Photoshop, Gimp, Pixelmator…).
Open the Theme content and all images ( contents/images/editable_images/image_…jpg).
Replace background with “Banner Image”
RapidWeaver 7+

Override Site Banner
In RW7 you can replace the current background. Just drag your image.
Add your image with “resources” option in RW

You’ll need to know how big the header picture is to start with. If you know already ( check the image size in the theme)
You can replace both images with the “resources” option.
Page inspector/header/css/….
#extraContainer2box {background: url(../resources/image_normal.jpg)center center !important; }
#extraContainer1box, #extraContainer2box {
background-repeat: no-repeat!important; background-attachment: fixed!important; -webkit-background-size: cover!important;
-moz-background-size: cover!important; -o-background-size: cover!important; background-size: cover!important; }