Answer:
Two in a whole and four in a pair. And six in a trio you see. And eight's a quartet but what you must get. Is the name that fits just one of me?
What goes around and around the wood, but never goes into the wood?
I am the yellow hem of the sea's blue skirt.
A thousand colored folds stretch toward the sky. Atop a tender strand, rising from the land, until killed by maiden's hand. Perhaps a token of love, perhaps to say goodbye.
My first half is normally made of stone, my second is crazy, and I taste sweet when complete.
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.