There many local examples of native plant gardens and landscapes open to the public for your to visit and take inspiration from. We recommend starting with the Native Plant Demonstration Garden Map created by Erin Goss for Partners for Native Landscaping:
Each year, Bring Conservation Home teams up with St. Louis Wild Ones to present a tour of private native plant gardens in a different part of the St. Louis metro area. Keep an eye out for announcements from St. Louis Audubon or check the Bring Conservation Home events section for updates on the next tour.
Grow Native! has a growing list of "Gardens of Excellence" across the state of Missouri.