I also will take squash, zuchini, onions, and bell peppers and grill them on my george forman indoor grill. They come out soft (not too soft) and sweeter tasting which is great especially in the summer.
Do you like corn on the cob? Take each individual corn on the cob if they are larger, sprinkle some parmesan cheese and butter on each and wrap each one up. If they are little, I use 2 to a section of foil and I roast in the over for about 35 mins at 375. If you really want to be decadent, wrap each corn on the cob with a slice of raw bacon then wrap them up and put in the oven. I actually saw this where they grill it but I don't have a grill outside so I use the oven.
I also do as others have mentioned and use the olive oil and salt/pepper then either grill on my little indoor grill or put in the oven. You can also coat them in breadcrumbs for somethind different. I also have used zesty italian salad dressing on squash and zuchini. I take my ziploc bag and pour the sliced up veggies in then pour enough salad dressing to coat and then I either grill or bake in the oven. A different flavor if tired of the same ole stuff.
I take raw broccli chopped up and put it some boiling hot water for about 3 mins then take it out and put in some cold water. I store it like this just to have to dip in dressings or put in salads. I've also taken chopped up broccli and put in a hot skillet with some olive oil or soy sauce, lots of garlic, and some red pepper flakes. Stir fry it for about 4 mins tops and gives a good flavor and you can garlic to taste.
If you go to foodnetwork.com and type in veggie recipes all kinds of recipes will pop up and they are rated easy to difficult and also have user feedback if they were good or not.