It's kind of ironic because grey hair is a sign of aging and it's obvious that these ladies are NOT old.
Top middle image (with the perfect eyeliner) is Ari Bardallis of spookypuke.blogspot.com; bottom second to the left with glasses is Sarah Cole of bodypartss.blogspot.com; and the blue eyed beauty is Celia Edell of ceedling.blogspot.com
All other images taken from style.com
If I had grey hair, I would wear lots of pastel and brightly coloured clips and it would be super cute if I had this headband:
from http://gracelizabetty.storenvy.com/