Prepare ravioli according to package directions. Drain and set aside.
In another medium saucepan, bring water to a boil. Add green beans and cook for about 3 minutes. Drain. Set aside.
In a large skillet over medium heat, melt 1 tablespoon of butter and add 1 tablespoon olive oil. Add chopped walnuts and stir. Cook for about 2 minutes to toast the walnuts. Add the drained green beans and stir. Add salt and pepper to taste.
Divide the ravioli evenly among the plates. Top with the green bean and walnut mixture. Sprinkle with blue cheese, and serve.