For kids this can be an afternoon party where your kids invite their friends over and watch cartoons in front of the TV or they can even decorate pillow covers to take home. Purchase puff paints or fabric painting kits that can be placed on the kitchen table, just make sure it is covered well. Teens will like this idea for an early evening party where they can tell ghost stories, play board games, and, if you have the ability, make S'mores. An adult-only get-together can include a breakfast bar with some mimosas and socializing. For family reunions, include some fun games like Pictionary with a large drawing pad on an easel so everyone in the room can see. If you have the right number of boys and girls, then make it a gender challenge or else just split up the guests equally.
Each age range can have its own spin on a pajama party. A fun game for guest of all ages that requires little prior planning is the wink and murder game where each player pulls a slip of paper from a stocking cap and some papers are blank and one paper identifies the player as the killer. Throughout the party, the "killer" winks at his/her victims and they have to fake their death a few minutes later and far away from the actual killer. Guest can guess who they think the killer is before they are wink-killed. If they guess wrong, they have to fake their own death. (The player has to whisper the question "are you the killer?" into the person they suspect's ear for a yes or no reply. If it is yes, they are the winner, and if it is no, they must fake their own death).
When we played this for our family reunion, my father-in-law turned out to be the killer and absolutely no one suspected him as he had a bit of difficulty getting around and is pretty quiet so he just waited for his victims to come say hello to him. One of my nieces even decided to up her game on her faked death by painting herself with horror makeup and fake blood. This game has been around for a while and has many different spins and names. I am not sure where it originated, but it is a brilliant activity that does not have to be planned.
Looking for Pajama ideas? We bought ours at http://www.jumpinjammerz.com/ because they had camoflauge footed ones for the guys. Of course, you can find cute pajamas anywhere.