My bows always wear bows. They have long hair so the hair is kept up in a topknot in bow. Of course I do stick to boy colors like blue or black. In the show ring even the boys have to wear bows. So I definately say yes to bows for boys!!!
Here are a couple of pictures of my boy Scamper wearing his bows. The last picture is Scamper and Destiny. See his bow is blue a boy color, and Destiny's bow is purple a girl color.