The Friends of the Gardena Willows Wetland Preserve are installing a water-wise native plant garden at the Willows Preserve. This one has an interesting twist since it's clear that they are building a demonstration back yard garden that could be implemented in the surrounding community, complete with back yard patio / shade structure. Their blog has lots of photos of the infrastructure going in and now they are ready to plant. I'm pretty sure they won't have any evil lawn.
There's an upcoming planting event that you can find out about by emailing Connie Vadheim or sending a message through their blog's contact.