We do a buffet style meal (what we now call a "platter" as it has evolved into our "Sunday Roast" alternative, although less special on a weekly basis).
Sliced meats, things like salamis, parma ham (Lidl do a great one), Braseola etc. Maybe some spiced beef or cooked chicken as well.
Often there's some smoked salmon and brown bread, and prawns with seafood sauce, and squid rings.
A plate of veggies - carrot sticks, pepper sticks, sugar snap peas, baby plum tomatoes etc.
Dips - hummus, guacamole, salsa, sour cream and chive etc.
Cheese board (we start it Christmas Eve and continue all the way through Christmas, so decent sized pieces of at least 1 creamy, 1 hard and 1 blue cheese, and probably another 2/3 as well, lots of grapes and a mixture of crackers).
Breadsticks
A nice glass of wine for DH and I, DD makes fizzy squash with sparking water.
Basically, lots of nice things to graze on, with some goodness in there, and mostly in the savoury end of things. If there is a desert, it's usually something like cookies or a chocolate pot or similarly small things.