Generally Bunny uses her zippered insulated lunchbag with all washable containers, both because I believe in reducing waste and to support her school's 'Go Green' program, where they encourage responsible lunch packing, and also use compostable trays, etc., to serve their hot lunches -- and they compost food scraps, too!
Once every week or so Bunny gets the hot lunch. Those days I just pack a paper sack with a small snack. To me 'decorating' the bags involves writing her name and putting a sticker on it to make her smile.
Well this mom has taken it to a literal art form. Lunch Bag Art is a blog with a photo of the art she draws on the bag daily for her children. I am neither talented nor quick enough to pull off these feats. Check it out!