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The Ohio State University Knowledge Bank (https://kb.osu.edu/dspace/)
Description & screenshots:
https://github.com/osulibraries/DSpaceOSUKB/wiki/XMLUI-Customizations-to-Themes
Repository:
https://github.com/osulibraries/DSpaceOSUKB
https://github.com/osulibraries/xmlui-webapp/tree/master/themes
SUNScholar (http://scholar.sun.ac.za/)
Mirage customization HOWTO:http://wiki.lib.sun.ac.za/index.php/SUNScholar/Asset_Presentation
Repository:https://github.com/SUNScholar/xmlui-webapp/tree/master/themes
Locally hosted:http://web.lib.sun.ac.za/style/sunscholar//
Miami University of Ohio (https://arthur.lib.muohio.edu/)
Elias Tzoc has created some interesting themes, including a Newspaper theme with image zooming.
His resources page is located: http://staff.lib.muohio.edu/~tzocea/files/dspace/