Springshare highlights these K-12 library libguides.
Scotch College in Perth, Australia -- and Brad Tyrell's guides definitely deserve being pointed out. Their Libguides have a very polished look -- and they have obviously used the customized CSS (Cascading Style Sheets) and HTML options. Without them sharing exactly what they're done, it's difficult to mimic their look.
Example of Scotch College page:
I particularly like how they use numbers -- 1, 2, 3 -- to indicate levels of complexity of resources listed. (Something anyone can mimic.)
Another example of an institution using customized CSS and HTML to achieve a different look -- what is known as the Bento Box Style --- is the National University of Singapore (NUS).
Aaron Tay and Feng Yikang, the two librarians behind that customization, recently published an article in the Code4Lib journal (see here) explaining how they did it. I saw them present at ALA (the American Library Association) last June in a session called "Library Guides in an Era of Discovery". See https://storify.com/rusa_ets/library-guides-in-an-era-of-discovery-layers . The presentations stretched my mind (and thinking about our Libguides and discovery layers).
Our library team isn't at this level of technical sophistication, but we may be able to mimic the Bento Box design a bit. See here how Barb Reid created a Bento Box image and put links behind each.
The method above was too slow to load. I now prefer TAGUL
We are starting to catalog our Libguides in our OPAC (Destiny), so people searching our catalog for information on "Extended Essays" -- for example -- would find any Libguides we had on the subject, e.g., this one.
We also use Libguides as a place to document our cataloging procedures, e.g., see this Libguide on "Cataloging @UWCSEA East". Note: this is a constant work in progress, edited by Susanne Clower, our campus librarian. Feel free to contact her for details and questions -- firstname.lastname@example.org .
Perhaps the best use of Libguides is as a front end to our catalog, as a way of providing more customized access to our Resources Lists and to "canned searches" in Destiny, which in the OPAC are hard to find and only sorted alphabetically.
For example, see this page we have to let teachers know what books they have in their class libraries and other types of booklists.