Prepare white rice according to package directions. Let cool.
Meanwhile, preheat oven to 425°F. On a large baking sheet, toss together grapes, balsamic vinegar, olive oil, salt and pepper. Bake, shaking baking sheet every 5 to 10 minutes, for 18 to 20 minutes, or until grapes are blistered.
In a large bowl, combine rice, roasted grapes, arugula, feta cheese, toasted almonds and balsamic vinaigrette.
For added protein, top with roasted tofu or vegan sausage.