For grilling fish or chicken wings or veggies, you can use something like the BBQ Buddy Grill Top (at least that is the name here in Canada). It's a shallow medium weight foil pan with a "corrugated" bottom and lots of slits for heat to enter and liquids to drain. You could make your own with a doubled length of aluminum foil, use multiple folds to create the "corrugation" and a large knife to cut some slits.
Of course you can also buy the various grill top accessories made of "non-stick" metal (which always seem to stick for me) but then you have to clean and wash them and one of the attractions of grilling for me is no messy pans to clean!!!
Kebabs - I love kebabs on the grill, but my husband says it's a "girl thing." He figures men only want to cook big pieces of meat.
Still, I think chicken pieces marinated in different sauces are fabulous. Or prawns.
For chicken, I read recently to try marinating 1 lb of pieces in a couple of tablespoons of lemon juice plus 1 tsp salt for an hour, then marinate overnight in a Tikka or tandoori sauce (or add curry mix to yogurt and a small amount of oil). I would thread this onto skewers along with chunks of mango and serve with some mango chutney or a mango salsa.
Spicy prawns with fruit is also good. Marinate or coat with a cajun seasoning mix, for example.
Marinated pork on kebabs along with pineapple chunks, red and green peppers and maybe onion is also tasty.
I use bamboo skewers and soak them in water for at least 30 mins. I used to have metal skewers, but that clean-up thing annoyed me....