I think the best thing to put on a flyer for this site is questions. These would be exemplary questions that sound interesting to people, similar to the ones that parenting has:
In the format: Question, Image, Tear off slips + QR code.
This seems like an intriguing historical question.
Can my Hacker have an army of robots?
That sounds particularly awesome!
What tools are useful to organize a GM's campaign notes?
Tips for organising a short campaign?
This isn't a question, but as it's a motto/tagline it just fits so well
And I've love to see it on a flyer!
We seem to be short on player-centric questions. Here's one:
What should I do as a player to prepare for a gaming convention?
What is the effect of a different probability curve?
How can I enhance both my GM and player skills?