Need to make MORE cupcakes :)

Well today the peapods get picked up....I must find some other people to make cupcakes for!!! I am the happiest making the darn little things my family laughs because I'm so smiley when I make them:)  It is so much fun, there's no stress & cupcakes make everyone HAPPY.  Now I am trying to think of a theme for my 18 yr old nephew's birthday. He is a musician in a band ... any suggestions?