Heat oven to 400 F. In a medium bowl, combine the oil, cilantro, chipotle powder, garlic, and lime juice. Add the shrimp and grapes. Toss to coat.

Starting and ending with the grapes, thread the shrimp and grapes onto the skewers in an alternating pattern. Arrange the skewers on a baking sheet in a single layer. Roast for 8 minutes. Enjoy immediately with lime wedges and extra cilantro if desired.