as you can see WIKIA are hosting a competition for the best Halloween themed wiki, with the winners getting promoted in the wiki spotlight.
I think we have a chance since we have Infection mode and Battle Begins.
First, change the background to an Infection wallpaper. then changes those images on our front page for Weapons, Maps and Missions to Infection images as well. Change the poll to "How do you fight the infection?" Hole up/Camp, Solo, Team up, Get better weapons first. Change the trailer to an Infection trailer, and
Change our theme colours from black and white to some combination or orange, red, or purple and black or white. (prob not purple) maybe grey? or even green? (my pick is red and grey)
if we really want to win, photoshop the background of all our images to have zombies or robots or bosses. (mainly weapons)