Salad bars are a great addition to school lunch programs. Salad bars can be served as a complete meal with a grain and a protein/protein alternate option on the bar, or as the daily fruit and vegetable options to complete a meal. These bars are the perfect vehicle to increase veggie comsumption for the USDA required vegetable groups! 
The Illinois Farm to School Network has a Mighty Mini Video entitled Salad Bars 101, located on the Mighty Mini video tab. This video is chocked full of information and tools for creating school salad bars.
Let’s Move! Salad Bars to Schools
This partnership between United Fresh, the White House, the Center for Disease Control, and others, helps provide resources for schools to install salad bars. Applications for School Districts can be found here, and information and a toolkit for parents can be found here.