MARINATE, in separate dishes, olives in raspberry vinaigrette; mushrooms in Italian vinaigrette; bocconcini in tomato vinaigrette; and peppers in 1/4 cup of the balsamic vinaigrette at least 1 hour. Remove all ingredients from marinades; discard marinades.
POUR remaining 1/4 cup balsamic vinaigrette into serving dish for dipping bread; place on large serving platter.
SURROUND with the bread and filled serving dishes.