If you're Forge skills are downright spooky, Forge Hub wants you to try your hand at an Infection map variant. Both tricks and treats are acceptable, but they'll be on the lookout for a fresh take on the old staple. If you're up for an October challenge, the details and link are below.
"With October 31st looming over the horizon, the time has come for the latest Forging competition to flood the streets of Forge Hub; and what better way to celebrate the occasion of Halloween than playing a good old game of infection?
Zombie Survival 101 (Contest Rules):
All Halo 3 maps, both DLC and Pre-DLC, are fair game
Submitted maps must be compatible with the Save One Bullet infection gametype
Budget Glitching is NOT allowed
Map submissions may be backdated as far as October 1st
All map submissions must be posted in the Submission Thread by October 25th
Limit of one (1) map per entrant
Co-forging is allowed but limited to a max of 3 forgers
Submissions will be judged based on their overall enjoyment and aesthetics, but we aren't looking for more of the same."
Hub of the Dead Forge Contest