I have found using github's language search to be helpful for this sort of thing. If you are using ruby, for instance, just search for https://github.com/searc

I have found using github's language search to be helpful for this sort of thing. If you are using ruby, for instance, just search for https://github.com/search?q=language%3Aruby https://github.com/search?q=language%3Aruby and look for popular codebases. You can decide which are beautiful for yourself.