Layout Options (background color, background image, etc.) don't work on BuddyPress pages.
This is a known issue. BuddyPress does not currently support the get_post_meta() WordPress function for specific BuddyPress pages, so unfortunately you cannot use the layout options on specific BP pages. This is being monitored and will hopefully be fixed on BP's end soon. For now the general theme options will be applied to the BuddyPress pages.