kabal of broken dreams, please help with symbol!

So I have finaly decided on the name for my up and coming kabal. Kabal of broken dreams. But I have no idea how to represent it on bannersand sails. So I turn to you for help. What symbol could represent either a Dream/ nightmare or a broken dream? Something simpel enough to paint :-) I hope you can give me a few ideas! The army will be painted in dark blue with either white or brighter blue highlights.