Perhaps a years-long project, but I have a vision to develop locally-adapted strains of Lilium bulbs through landrace gardening. I've already gathered seeds of a large number of different species and hybrid strains, through seed exchanges such as the North American Rock Garden Society, Pacific Bulb Society and others. I've grown up these seeds into plants that are gradually reaching flowering size. Over the last couple of years, I've saved seed and replanted that seed to continue the strains.
This genus for me is of great potential, not only for its unparalleled beauty, and support of pollinators like hummingbirds and butterflies, but because many of the species have a long history of edible use by indigenous people in my area (the Pacific Northwest). Northwest peoples have roasted Lilium bulbs (like other bulbs such as Camas) in pits with coals. Meanwhile, in Asia, other species are commonly used in cooking. I think it's possible to find some edible species such as Lilium davidii, Lilium lancifolium (the true "tiger lily") in Asian groceries in my area. Being a starchy root, Lilium bulbs can be used like potatoes - roasted, added to soups, dried and ground into a flour, etc. They can also be added to stir-fries.
However, many species and strains are not suitable for growing as perennial vegetables, because they are too slow-growing, are bitter-tasting, or have other cultivation issues such as disease susceptibility. Some strains are just the opposite, one example being Lilium pardalinum var. giganteum, which is a very vigorous type found as a wild plant in the Van Duzen river area in Northern California. I started seed of this type in 2014 and through division of the resulting bulb clumps, I now have a large patch. Furthermore, I've also used vegetative propagation (scales from the bulbs) to increase the numbers much more quickly, to the point where its level of production makes it a realistic crop. In some permaculture systems, it could be grown as a backup food source, primarily enjoying the flowers and supporting the pollinators.
It's still a slow process to grow multiple generations of plants, but there's a whole community of Lilium hybridizers who do it routinely, but that community doesn't have much intersection with the permaculture community. Most breeding is being done with flowers in mind, not eating qualities. Nonetheless, strains from hybridizing projects that others are doing are still potentially edible and can still contribute to a landrace breeding project.