Because I'm the only amazing graphic artist here
I suck at coming up with them but I'll say I already have one in planning. It may or may not be done but I won't say it.
That said, banner suggestions are go. Mostly "keep it game related" You're allowed to suggest images and really, go wild with suggestions. More creativity and ideas for me to work with makes the better!
Silver banner
Scribblenauts sir.
Luigi Galaxy
Marisa from Touhou :3
I think it would be cool to do something along the lines of Bioshock; Have NSFCD in that kind of brass sign with vegetation growing around it.
A SSBB banner. Let's make this site worth of having the "N" letter in NSFCD.
Here are some ideas.....
1: random pictures of landscapes or scenes found in games
2: either really epic scenes in a video game, or possibly a scene that shows severe irony
3: showing games in different art styles. For example, super smash bros, Mario bros, or sonic the hedgehog in a south park, robot chicken, or nes pixel art style.
4: have certain parodies of games. Like mixing two different genres with one another