I love appetizer parties and do one every xmas eve.
I always have the basics, Veggie tray, cheese cubes, crackers and cheese ball, but each year I add different things to this. A big favorite is twice baked potatos and they are really easy.
Take a bunch of smallish potatos and bake them (I do it in the microwave).
Cut them in half, scoop out the inside and mash it and mix with different yummy things.
Sour cream, chopped chives, butter
Cheddar, bacon bits, butter
Garlic, butter, cheddar cheese
Ranch, cheddar, bacon
Really, do whatever you like. Scoop the mashed stuff back into the skins, sprinkle with cheese and bake until melted. They fly off the table!
Mini pigs in the blankets are fun too and the kids really like them, so do the guys.(wrap cocktail weenies with crescent rolls and bake)
Roll up sliced meats and toothpick them, have sliced cheese and rolls too. If people want to they can make sammies, if not they can eat the meat and cheese and rolls.
all of this stuff can be done ahead and replenished as needed.
keep it simple so you can have lots of fun!