I found some Christmas themed photo props at Dollar Tree and bought them to use at our yearly Christmas party at work.
Our party is at work while we're working. We set up in the back hallway. There's a table for food and a table for gifts.
I set out the photo props with a sign that said pick a prop and pose. Whenever someone came through to fill a plate for lunch I went out in the hall with my cell phone and told them they had to pick a prop and pose or I would take their food away. I got very little argument. There were only a few that I had to convince and even that didn't take much effort.