Tina, so far only possible solution is looking into Moodle's registered sites of schools/universities. Even 95% of them haven't been designed to the extent where one can actually get an idea from them as mostly are using default themes. It's so far only few of those who are directly responsible for Moodle's at their respective institutes coming out with Themes which they eventually let it out in public as well. Few themes are exception though like Essential, Elegance, and I believe Richard's themes are designed for Moodle community only as well.
Moodle community sites
A Possible Moodle Show case link on moodle site
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