Practice what you preach; sharing your rules, guidelines and brand assets goes best in a branded environment. Using the Theme Editor you can give your BrandPortal the look and feel it deserves.
Quickly respond to changes
Your brands are probably always moving. With the Theme Editor you can easily set the colors, backgrounds from various elements but you can also change them in a few seconds if something changes. This enables your organization to quickly react to a temporary campaign or structural rebranding. Change the used logo's, background images and colors and you are good to go.
Use global themes or brand themes
If you have multiple brands setup as sub-portals you can either decide to use one global theme for all sub-portals or theme every brand separately.