My mums side of the family went sorta healthy over the past few years which means every christmas for that side of the family we don't have chips and lollies. Instead we usually do the following:
Platter full of summer fruits like kiwi fruit and rockmelo and water melon (although i did jst learn that watermelon isn't that great for you)
A vegie platter of julienned celery, carrot, brocolini, capsicum and snow peas with a healthy dip.
and my favorite,
i big bowl filled with many berries, blueberries, cherries, rasberries, strawberries, blackberries, mulberies, goose berries (all sorts) with a riccota cheese dip that has low fat ricotta, honey, cointreau (doesn't have to have but gives it a little kick) and lime juice. its so yummy together. I look forward to it every year.
I love having the option of healthy food. I find if its just chips i will sit there and constantly eat them and feel guilty after wards but if i have the choice i straight away go for the healthy option cos its yummier, i can sit there and graze and not feel bad.
The idea of a guilt free party i think is great but not everyone would think so, i tried it with some of my friends once, i asked if they'd be happy to have berries and fruits instead of chips and they got grouchy at me and said no. They hated the idea! They said it wouldn't be as fun.