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Santa hats on
Everyone in the photo wearing a Santa hat (real or homemade from paper or a sock). All at once, no excuses.
Skeleton pose
Team poses as a skeleton: arms by your sides, mouths open, eyes wide. Or find a skeleton decoration and copy its pose exactly.
Snow or almost-snow
If there is snow: photo in the snow with the team. No snow? Take a photo of something white (a sheet, paper flakes, foam) standing in for snow.
Spiderweb hunt
Spot a spiderweb decoration (or a real spiderweb outside) and take a photo of the team looking tangled up in it.
The spookiest house nearby
Find the house with the most Halloween decorations nearby and take a team photo with it. From a distance is fine if the residents are not up for visitors.
Trick-or-treat snapshot
Take a photo of the moment you ring the bell for trick-or-treat (or when you open the door for others). The more surprised, the better.
Ugly Christmas sweater
Find, borrow or invent the ugliest Christmas sweater you can. Take a team photo with as many ugly sweaters in frame at once as possible.
Unwrapping pose
Photo of someone unwrapping a gift super tense or super excited (it can be a box, a bag or a wrapped book). Exaggerate the reaction.
Warm drinks
Photo of the team with mulled wine, hot chocolate or another warm drink in both hands. Steam rising is a bonus.
Witch on a broom
Someone grabs a broom and pretends to fly on it. Photo of the take-off moment, with a cape or black hat as a bonus.
With Santa
Find a Santa (real or a decoration, an inflatable one on a roof counts too) and take a photo with the team next to him. Wish him a merry Christmas.
Worst or funniest costume
Photo of the least successful or funniest costume of the night. A bin-bag Batman, a sheet ghost, pyjamas with ketchup blood: anything counts.