I made these up a few weeks ago. They turned out really yummy.
3-4 skinless, boneless chicken breasts, cut into 1-inch pieces
1 can pineapple chunks
1 package cherry or grape tomatoes, whole
2 large bell peppers, any color, cut into 1-inch pieces
1 medium onion, cut into wedges
1/2 bottle Russian salad dressing*
1/2 bottle Greek vinaigrette salad dressing*
Marinate everything together for three to four hours. Put on metal skewers (supposedly you can use bamboo skewers if you soak them in water beforehand. Mine always end up burning, anyway, so I invested in metal skewers) in an arrangement pleasing to the eye. Try to put tomatoes or peppers at the ends, as they'll grip the skewers the best and keep everything else from sliding off. This step actually ends up taking ten or fifteen minutes, so make sure to count on that in your prep time. Pour extra marinade over the skewers to make sure everything stays moist (I mean to do this before grilling, not during, since the marinade will probably have some salmonella). Grill skewers until the chicken is cooked.
*This is actually what I had lying around in my 'fridge. I'm sure other salad dressings would work, like Catalina and Italian or whatever. I do like the combination of an orange/red dressing and an oil-based dressing, though.