Not sure if you've decided yet but if you are still looking for ideas, these parmesan cheese wafers are soooooo easy and very tasty:
200g coarse grated parmesan cheese (I buy a bag, it's easier)
2tbsp plain flour (or you can use rice flour/potato flour if there are any wheat intolerants in your group)
2 tsp olive oil
pinch black pepper, ground
pinch rock salt
Optional extras: chilli flakes, fennel seeds (1/2 tsp each)
Grease a flat baking tray and put in the oven, preheat to 190 deg C
Put the cheese in a large mixing bowl and add in all the dry ingredients, mix well.
Add the oil and rub in gently with your fingertips to give a dry crumbly mix.
Remove the hot tray from the oven and drop 1tbsp of mix at a time onto the hot tray, using the spoon to shape the mix (the recipe suggests rounds but I tend to do fingers). You may need 2 trays for all the mix, depending on how large your tray is. I think I get between 16 and 20 fingers but am not sure, it's been a while! 
Bake in the middle of the oven for 10mins; then turn them over and bake for a further 3-5 mins until they are golden brown and lacey in appearance. Allow to cool on the tray for about 5 minutes then use a spatula to remove them to a cooling rack.
They're best done on the day; they do stay nice for another 24h in an airtight container but after that they tend to go off a bit. They are VERY moreish 