I have no talent for flyer-creation graphically, but I'd like to toss this thought out:

It might make sense to tailor the fliers somewhat based on where you're planning to post them or what kind of people you're hoping to see them.

For example, if you're going after a D&D crowd, maybe let's talk about why CF is better/different than D&D. (I could also argue that D&D is better/different than CF; both are going to have their strengths and it's our job to highlight some of ours.) If you're going after (possibly poor) college students, maybe it makes sense to mention that CF is completely free and all you need to play is any computer with an internet connection, etc.