Mummies - teams of three, with two people trying to mummify the third in loo roll. Set a time limit, tidiest mummy wins.
Who Is This? Cut out pictures of the faces of famous people/characters, stick them onto sheets of paper and number them, and people have to list as many as they can identify.
Chubby Bunnies - first player puts a marshmallow in their mouth and says "chubby bunnies". Puts in another marshmallow, says "chubby bunnies" - they carry on inserting marshmallows, one at a time, until they can't enunciate it clearly. Winner is the person who can hold the most marshmallows in their mouth and still say "chubby bunnies" clearly.
Cut up old Christmas cards into 25 pieces, give each person a cut up card in an envelope, they have to do the jigsaw - first to finish wins. You could do jigsaws with more pieces for the grown ups and fewer for the children.
I've used all of these at Christmas parties, and they were all successful, apart from the Xmas card jigsaw one, because I cut up two cards for each person and mixed them up, so they had to sort them out and reassemble them - no-one managed it, and several people threw their jigsaw bits all over the front room! 