You can use any vegetables you like, but our favorites are onion, peppers, mushrooms, squash, and grape tomatoes. Cut everything in relatively the same size. Cut chicken breasts into one inch cubes.
Remember to soak your wooden skewers in water so they don't burn. Stack your skewers in any way you want, if someone doesn't like squash or loves tomatoes, you can make the skewers to match each person or you can do them all the same. I tend to be random when I'm making the skewers. I try to make sure I have all the colors on the skewers.
For the marinade, I usually use a zesty Italian dressing. I use full fat for the oil to keep the kabobs from sticking. You could use low fat but you would have to be sure to oil your grill grates. Sometimes I will use the a Greek style marinade (olive oil, oregano, lemon juice and garlic)
These are delicious. You'll have to take my word for how good they look when they come off of the grill. They looked and smelled so good, folks were diving in before I could get my camera out. Give them a try and see how quick they will fly off of your plate.