How about mixing some very small diced courgette, mushroom and onion, mix with some sticky rice or couscous and wrap in cooked cabbage leaves or vine leaves to make a little parcel with a cocktail stick through to hold.
You could add veggie bacon bits as well or little pieces of veggie sausage too.
Or veggie sausages in a honey and wholegrain mustard marinade in a light puff pastry jacket.
You could also make mini toasties or paninis with these in or something like veggie sausage and grated cheese.