Do use any color or even better a combination of colors be it red, orange, yellow. Yes, you can do this stove top over direct flame of in a very hot oven. I prefer the smokiness of them on the grill. Add to salads, sandwiches, puree and spice it up for a dip or sandwich spread, in a wrap, Make a roasted pepper pasta sauce, and to salsa, rice and beans, great on an on pizza, wrap a cooked shrimp or scallop, or simply as a side veggie. Endless possibilities!