Ham cubes (or chicken cubes)
Pineapple chunks
Orange slices (and anything else: onion, peppers, bacon, par-boiled carrots, potatoes) --place on sticks

Mix:

1/2 c. butter
1/4 c. pineapple juice
2 tbsp. lemon juice
3 tbsp. brown sugar
1/8 tsp. (each) cloves, dry mustard

Warm over low heat and marinate kabobs while grilling; put tin foil under grill to catch drippings.