I love buttons. I've been collecting them at every flea market and place they are found for a long time.
When it's time to put that fab creation together, the buttons can make or break the whole concept.
Modern? Traditional? Feminine? or Funky, buttons will set the style faster than even the design itself.
They are a focal point if you choose a lot of contrast in style or color. Or they can be low-key and fundamental to the design in a subtle way.