Star Trek fans for sure know the Library Computer Access/Retrieval System (LCARS). The user interface was first shown in Star Trek: The Next Generation. The cool thing about LCARS is that it uses quite big, non-overlapping controls. That makes it a good choice for a home automation visualisation. Have a look at this interface:
If you want to design your own LCARS-like UI, you will find a lot of interesting designs with a simple Google search.