MSP Customer Branding

Would it be possible that when a user/group logs on branding for the GUI can be defined i.e. A customer logo assigned to the GUI rather than the global branding. I know this is probably not possible to the login landing page but afterwards it would be nice that each group or users can have seperate branding applied. Very useful for MSP's. I know of child tennats in LM but I believe this is not really supported any longer and may have cost implications (not sure)