Admin templates are most widely used templates where design is less cared. Many people including I would prefer a the template somewhat similar to the frontend website but gives a distinct vision to tell the admin that s/he is on the admin side, and not on the front end. If I can find a good one, I would stick with it, and customize it for individual projects.
I just posted my message here to search for a good admin temlate, if you know already. And the search results “free admin template” did not list me good links in google.
Thank you for sending me links to good admin templates.