I buy the jarred ones in oil also...
I put them in my salads. I also use them in pasta dishes, like with chicken and sun-dried tomatoes in a garlic and oil sauce.
And my aunt taught me a recipe she makes, super easy... basically toss everything in a baking dish and bake it: Boneless chicken breast, sliced black olives, canned mushrooms, artichoke hearts, and roasted red peppers bake it together in the oven, it makes a very tasty casserole.