Adam found this recipe for grilled vegetables with thyme, and yum! It's red potatoes, bell peppers (red, yellow, and green) and pearl onions with thyme, a little bit of salt, chicken broth, and olive oil. That's it!
You can do them on the grill as the instructions say. Or you can do it in the oven in a baking dish at 350 for the same timing as on the grill.