I make no secret of my love for Wikipedia. It's a great resource, and a great demonstration of what's awesome about people.
Especially this page of "Organizations in Wuxia fiction".
That's YEARS of DINO-PIRATES OF NINJA ISLAND campaign ideas, right there. See, the ninjas of NINJA ISLAND are organized into an endless array of clans. And these organization names are PERFECT ninja clan names. Just reading these names triggers off thousands of ideas for stories.
What's the secret of the Yan Family Fist? Who is the King of Herbs? Where do I find Sky-Touching Cliff, and while I'm at it, how do I join the Carefree Sect?
Kingdom of the Golden Bird. Thunderbolt Hall. Dead Warriors of Qingcheng. Seriously, this list goes on and on, and every one of these would make for a great ninja clan amongst the islands.
Also, there seems to be a large number of, um, escort agencies. I guess heroes got needs.
The Heaven-Forsaken Nunnery!
On the left here, is a picture of Obsidian Tiger, who belongs to the Gilded Fang Cult. So there's already some pretty crazy ninja clans running around in the islands. But those ladies at the Heaven-Forsaken Nunnery? I shudder to think what they're like.