Here's a couple things you might want to try.

1 - Put Onions and Bell Peppers and Jalepenos in one of those baskets used for grilling fish... there's usually a slide on the handle end that will give your veggies a nice tight fit. It's not going to fit very well in most standard charcoal or gas grills so just keep turning it and moving it around for a few minutes... perfect for fajitas. Oh don't forget to drizzle olive oil on everything.

2 - Portabella mushroom caps brushed with olive oil and grilled make an amazing topping for your burgers. The mushroom caps will lose a bit of moisture during the cooking process and flatten out a bit, so don't be intimedated by there size.

3 - add margarine, salt and pepper and Feta cheese to corn on the cob and roll in foil. Big time flavor on this one.

I could be here all day but I need to save something for future posts:p

Grilled ONIONS!!!!!!!!!!!!!!!!!!!!! The best grilled vegetable ever.

Asparagus, mushrooms, green beans, Onions, tomatoes, Vidallias (to make a French onion soup), and potatoes.

I too love the grilled onions. I also use a cast iron skillet to sort of bake all kinds of veggies. Usually a mixture of squash, onions, tomatoes, bell peppers etc. With the lid closed I find a 10 - 15 minute head start on whatever meat you're grilling is about right. Drizzle some olive oil on it and add some Mrs. Dash extra spicy or whatever. Just give it a stir whenever you check or turn the meat. BTW I put the skillet on the upper "warming" rack, not on the grill.

I love grilled vegetables. One of my favorites is zucchini sliced and drizzled with olive oil before adding garlic, salt, pepper, and marjoram.