We have crazy hat parties at our church and you can do sooooo much with a hat.
I have seen hats with sail boats on top and all around the edges, to look like water, the person added blue ribbon. They even glued in plastic dolphins to look like they were jumping out of the water, around the boats.
I have seen cone hats that are covered in ribbons, hats that look like animals, flower hats that have butterflies and other bugs on wires so they look like they are moving, martian hats, fruit salad hats, and more.
If you make a hat, post the pics. I would love to see what you come up with!