Chicken with lemon/mustard mayo (ie squeeze lemon juice and bit of mustard into mayo!) and rocket
Foccacia in half then put spinach tomates and mozzarella or jars of deli roasted veg (peppers, etc) and maybe spreadable goats cheese. Weight down the foccacia to flatten it a bit and then slice (might be a bit messy though - not sure how finger food it might be?)
Hummus, grated carrot and ham or cheese
Hot smoked salmon or trout and cream cheese.
Maybe open sandwiches -
Smoked salmon
roast beef and mayo with a bit of horseradish and cress or rocket
I've got Jo Pratt's In the Mood for book and in that she does a white bread sandwich (chicken I think) which she cuts crusts off and then very lightly spreads mayo on one cut edge and then dips in poppy seeds - looked brilliant, very snazzy.
Maybe a selection of teeny rolls with fillings together with different types of bread - white, olive, granary, rye (an open rye with smoked salmon would be nice).