Silicone muffin cups by wilton make great dividers in lunches. Michaels and walmart sell them. 9.99 check the net for a 40% off coupon to Michaels and save $4. They hold small items and are easy to tuck in between other foods :)
Healthy DYI Pizza with Pepperoni School Lunch. Lunchables vs. MOMables. PC makes mini slider thins buns, they would be perfect for this. More like the "real" thing. That and the Natural Selections salami (SO tasty). The girls love these!!!