Beautiful No-Mow Yards: 50 Amazing Lawn Alternatives https://www.amazon.com/dp/1604692383/
Lawn Gone!: Low-Maintenance, Sustainable, Attractive Alternatives for Your Yard https://www.amazon.com/dp/1607743140/
In Colorado, check out the Colorado Native Plant Society or the Colorado Cactus & Succulent Society. Denver Botanic Gardens is also wonderful with outreach and education efforts, but they're not strictly focused on native plants (as far as I know).
Maybe it's because enough people have realized how nice their yard could be, maybe it's small spaces and hills, or maybe it's how difficult and irresponsible it would be to try to keep the grass green in the summer. Either way, I freaking love a lot of the landscaping around here, and have been extra-excited by yards massively overgrown with wildflowers, etc.