A variety of body (page) background options are included with this theme. Options include solid colour-fills, background patterns supplied with the theme or you can load up to five of your own custom images into the theme to use as a suitable background.
To insert you own images, open the theme contents and navigate to images > editable_images. In this folder, you can edit or replace any of the existing images with your own. Then select them for use in the theme settings (pictured above). Images you insert into the theme must match the corresponding file name presented in the theme settings.
You can either use Finder to open and edit the theme contents or RapidWeaver Theme Miner. Some users prefer to use RapidWeaver MultiTool, but this utility has not been updated for sometime and is currently incompatible with Snow Leopard.