1To make each radish eyeball, peel radish, leaving streaks of red skin for “blood vessel” effect. Cut off one tip of radish about 1/4-inch deep. Using small melon baller or paring knife, scoop out small hole from sliced tip side; place olive half in center. Place in martini glass.
2To make each grape eyeball, carefully peel back skin of grape from one edge. Using small melon baller or paring knife, cut small hole in center of exposed flesh. Place small cranberry or blueberry in hole. Skewer grapes onto toothpick; place in martini glass.
3To make each olive eyeball, place baby carrot in pitted hole of olive. Cut off carrot flush with end of olive. Skewer olives onto toothpick; place in martini glass.
4To make cocktail, place several ice cubes in cocktail shaker or mixing glass. Add gin and vermouth. Cover; shake (or stir) 30 seconds. Strain into martini glass and serve.