I've always loved seeing the boats flying the colorful spinnakers....those billowy sails that are used with relatively light/steady winds coming from behind your boat. They're usually big and colorful.
This is one I posted about a few years ago on the Pamlico Sound:
Here are a few I nabbed from the web:
We picked up our spinnaker today....
We'd not seen it yet...so, Duane hooked it to a pulley that raised it to the top of the hangar (about 24' high) the sail itself is about 45-50' tall....and this is what it looks like. The letters say "TOBAGO":
Not quite as colorful as I was hoping....but will be thrilling to fly it the first time!