I only glanced at the generator, but didn't give it too keen a perusal. My hope would be to both come up with prompts that the generator might not (be they more generic or extra specific), and to create threads which launch discussions based on a single topic. Certainly, if someone uses the generator and finds a particularly interesting prompt, they could post it for others to use and discuss, as well. Testing it just now, I got "Imagine a fruit that can be used to make armor"...
Pretty cool, right? Take a look at the source code, and you'll find that it consists merely of... what, fifty such templates?, with "fruit" and "armor" being variables (I still have the "Imagine a plant which could be using in building" to challenge myself with taken from the generator). Expanding it even by ten strings would mean a great deal more prompts.