CU, you're thinking too small. Who says the creativity is even part of a forum? Create things in your environment, the one in which you live. Create things IRL. Create things in your entire life, not just your online life.
Log off, shut down the computer, and go do something that will physically affect your environment. Hanging out with a bunch of online spags isn't going to change the people around you. Posting on a forum isn't going to traumatically affect the people who read it (please, no pedantic exceptions).
When Cram says, "Be the trouble you want to see in the world," he doesn't mean hiding behind an alt while trolling MysticWicks. He means going out the front door and CREATING something that's interesting. Or at least, that's what I think he means.
I agree absolutely, which is why there's now a real-world/collaborative forum dedicated to doing that at the bar and grill. As in - making it easier to meet up with other like minds in your area, because having local groups dedicated to making mischief in the real world makes it incredibly easier for the long-tail to contribute.
There are people reading this right now who could meet up for drinks tonight and start something going in meatspace together, they just don't know it.