Buy lots of garnish - makes all the difference.
PLatters of sarnies, cut into triangles and crusts off. Tuna/cuke or tomato, roast beef and horseradish, ham and mustard, sliced egg and tomato. Mix brown and white bread sarnies on the plater. Drop watercress and tiny tomatoes over the top.
Garnish samosas/pakoras/indian snacks with slices/wedges of lime and coriander.
Cheseboard with stilton/blue cheese, hard yellow cheese e.g. cheddar, soft cheese such as brie/camembert. Bunches of red and green grapes, sticks of celery in a jug of water, biscuits arranged in a nice basket alongside, maybe some nuts too.
Chicken satay sticks with sweet chilli or peanut dip - again something green e.g. coriander.
HTH
Put crudites in colourful blocks around a central dip: dip in bowl in centre of round plate, strips of red, yellow, orange, green pepper, cucumber, carrots, etc in blocks around it.