You can get some great accessories for your gas grill. These can add a lot of cooking options such as:
Smoker box: There are a number of boxes you can use to turn your grill into a smoker. Simply add wood chips to the box and place it over the flame.
Rotisserie rods: If you want to cook a whole chicken or small turkey, you can add a rotisseries rod to your grill. The rod will rotate and allow the chicken to roast in its own juices.
Rib rack: This is a great tool to cook multiple slabs of ribs at one time. By adding vertical space you can cook additional items in addition to the ribs. Many of them have handles so you can transfer the ribs right to the kitchen or table.
Pizza kit: You can turn your grill into a pizza oven with a great pizza kit. These often contain pizza stones, pizza peels, cutters and screens. This is a great choice if you have a family with small children.