I have a pizza veggie dip that I ADORE and it always goes over well.
It started with a recipe but is so basic you don't really need one. It includes:
-cream cheese (chive and onion, or just plain)
-garlic (fresh if you want to mess with it, or a sprinkling of powder)
-spaghetti sauce
-whatever other cheeses you have on hand: parmesan, mozzarella, provolone...
you can layer it like the original recipe (cream cheese on bottom, sauce, cheese on top) or just mix it all together like it will get mixed after the first several dips anyway. just bake it in the oven at 350-375 until cheese is melted/heated through.
now I want some!