chicken tenders marinated in teriyaki or just coated in olive oil and some herbs (whatever you have, but rosemary or Italian seasoning are good).
Salmon - either small steaks or chunks on kabobs.
Kabobs are easy - I actually don't alternate all the veggies & meat was they take different cooking times - I put chicken chunks on one sets of skewers, peppers & onions on another, mushrooms and cherry tomatoes on another, etc. I also do potatoes on kabobs too - chunks of sweet potato and red bliss, whatever you want. You can also use fingerling potatoes or whole baby potatoes & onions. The red/white/blue ones look cool too. Skip the potatoes if others are preparing potato dishes.
Just take everything off the skewers in sections, and let people serve up what they like. It makes it fun for the kids who don't always eat everything or don't like when their "yuck" foods touch their "yum" foods.