Well during the holidays you can say "Happy Holidays."  You know this is actually a very good question.  When I read it I was like, what else is there?  Closing I find easier to come up with different phrases,  Have a pleasant day, Hope the commute treats you well, thank you for visiting, depends on the situation.  Good morning is pretty standard, it is what you say after that maybe?  Good morning, can I help you, Good morning what can I do for you?  Good morning, you are here to see?  That is what I come up with!  I am interested to see what others say as well.