Arrange bread slices on 2 heavy baking sheets. Drizzle 3 tablespoons of olive oil over the bread. Bake until crostini are pale golden and crisp, about 10 minutes.
Meanwhile, stir herbs, lemon zest, pepper, and salt in a medium bowl to blend. Using about 2 teaspoons of cheese for each, form the goat cheese into 1" balls. Roll cheese balls in the herb mixture to coat completely. Arrange balls on a platter.
Drizzle extra virgin olive oil over and around the cheese balls. Serve with crostini. Garnish with herb sprigs.
Can prepare crostini and cheese balls 1 day ahead. Store crostini in air tight container at room temperature. COver and refrigerate cheese balls.