Looking for School Lunch Ideas

Recently a friend posted a FB status asking for school lunch ideas. I thought it was a great idea because I am stuck in the pb&j monotony. I am looking for lunches that are easy, healthy, and will be eaten! One of the ideas was to cook brown rice with black beans on Sunday, put them into muffin tins and freeze them, then dole out a serving topped with sliced avocado. I thought that was a great idea, something I could make a big batch of on the weekend, and easy to prepare during the week. And pretty darn healthy too. What I am uncertain about is how to get the frozen servings out of the muffin tin? Do they pop out easily? I haven't tried it yet....

Anyone else have ideas they want to share?