I appreciate the pointer. However quite a number of those are fairly “vanilla”, and there is nothing about a “customers” page that explicitly says to me “we built these very different custom themes for all these sites”, which is more specifically what I was looking for. In other words that page seems to be, understandably, more about who is using Discourse, and less about how unique their use or design is, or that the Discousre team specifically did theme work for them. Honestly I think that might be a nice additional category or filter for that page: customers you did custom design/theme work for.
Anyway, I can appreciate that the info is there for people to sift through and find what they might be looking for, and I am grateful to @HAWK for taking the time to call out some specific instances that more directly met my expressed interest.