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Well, id say you got enough responses...but i'll give mine too.
I do a lot of vegies on the grill over the summer. For zucs and squash i cut in diagonals (enough of an angle to make pretty long slices but not quite completely lengthwise) just for a different presentation. Then usually just EVOO salt and pepper (maybe some garlic powder) and sometimes italian. and sometimes i just spritz with butter. But year hot and quck. I also got a grill basket and i will add a lot of vegies in it and then set on the grill and toss to mix/cook. Makes a great vegie side. Usually do that with zuc, squash, onion, peppers, sometimes shrooms.
I bought one of those pans that looks like a skillet with a bunch of holes drilled in it and i chunk up my veggies, toss in a light coat of olive oil and season them with creole seasoning. That little pan is a good way to keep everything together without having to deal with skewers and losing half of your veggies to to the fire gods when they fall through the grill.