Mustache is quite famous on Tumblr nowadays. You can use cool mustache themes, cute cursors and of course layout on your Tumblr blog.
Tumblr Mustache Codes
I am going to provide a URL on which you can get Tumblr mustache icons, Dashboard themes and cursors. Check out below screenshot of dashboard icons.
Above is just a example of mustache icons, You can get mustache cursor, Themes and much more.