https://wrappixel.com/demos/admin-templates/material-pro/material/index.html
好像是收费，不过确实很高大上
http://demo.cssmoban.com/cssthemes4/twts_22_startbootstrap/pages/index.html
很简洁
http://adminlte.la998.com/index2.html
好看，还免费
https://binarytheme.com/BTlivedemos/04-2014/10/bs-admin-bcore/notifications.html
色调有点乱
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