I am in the process for building to applications for blesta one for the customer side and one for the administration side of things.
I would be releasing theses to the MS and google play stores when theses have been completed and confirmed by blesta to be working. The client application I would allow to be customized from colour schemes, logo and what aspects you want the customer to access for example manage the services, view invoices and even a support ticket.
Customised ones would need to be submitted to the MS and the google play stores, I am looking for ideas from the community here about functions of both sides of the application you would like to see or in the first release.