Lightly coat the unheated grill rack with cooking spray. For a charcoal grill, grill skewers on the rack of an uncovered grill directly over medium-hot coals for 5 to 10 minutes or until fruits are warm and bananas are lightly browned, turning skewers occasionally. (For a gas grill, preheat grill. Reduce heat to medium-high. Place skewers on grill rack over heat. Cover; grill as above.) Remove from grill.