The design of your bathroom will strongly depend on the needs of your family.  Things like, the need for a shower or spa, storage space and budget are all things that need to be taken into consideration before jumping in to a bathroom redesigning project.  The main use for this bathroom also needs to be considered.  If it is just going to be a place you go to "get clean and get out" that will be very different from a place meant for relaxation.  Contacting a professional when you are at the early stages of planning to help ensure that nothing is left out will actually make every step along the way a whole lot easier and less stressful on you.