Customer Portal - custom brand colours

It would be great if we could add our own brand colours to the Customer Portal - if someone purchases a subscription to my SaaS application, but then does all their billing on a site under my own URL, but with completely different colours (the black, white and bright blue that is there by default), it really breaks apart the user experience.

At a minimum, please make it possible to change the colour of the following:
1. Background of the menu bar on the left of the screen (currently black by default), and
2. Each icon in the menu bar (such as 'Dashboard, 'Subscription', etc. which are currently white by default), and
3. Hover over colour when the curser is over a menu option, or an option is selected (currently bright blue by default).

The flexibility for those 3 simple colour changes would make a HUGE difference!

Thanks for considering :)