I've been invited to help out.
Although I'm not in the Dev circle, I basically manage #gdeveloper by myself z.z;
I've already pitched two ideas for the server.
-Side scrolling RPG (Think Maplestory ;p )
-Shooter (Think Counterstrike)
These of course are not very original ideas, but would be a little unique to graal itself, both being fun as well.
(But then again, what is original anymore? z.z )