Citrus Chicken Kabobs

Combine orange juice, lemon juice, lime juice, pineapple juice, olive oil, salt and pepper in a bowl. Whisk juices together well. Reserve 1/2 cup of this marinade mixture. Place chicken in a large ziploc bag and add the remaining marinade. Chill at least 2 hours, turning the bag frequently to coat the chicken. Cut peppers and onions into 1 inch chunks. Slice the mushrooms in half. Soak 8 wooden skewers in water for at least 30 minutes. Remove chicken from the marinade and cut into 1 inch pieces. Cut lemon, lime and orange into 1-2 inch pieces. Thread skewers with the fruits, vegetables and chicken in an alternating pattern. Preheat a gas/charcoal grill or ridged grill pan to a medium-high heat. Place kabobs on the grill and baste occasionally with the reserved marinade. Turn kabobs frequently and cook until chicken is done. Place on a platter to serve and garnish it with any of the leftover fruits.