Have you seen it in a clam shell at your local supermarket? I love the "live" butter lettuce that comes with roots, sunk into a water hole that comes in a clam shell. It is delicious and so fresh tasting.
Along side that today, was a new lettuce called cosmopolitan, a naturally bred proprietary seed variety, is the combination of Romaine and Iceberg lettuces. It is beautiful, sweet, and crunchy. It would make great wraps...if you happed to like lettuce wraps.