I also very much liked Social Buttons for Bootstrap. You just include their CSS and they show you how to create icons and buttons: <a class=”btn btn-block btn-social btn-twitter”> <span class=”fa fa-twitter”></span> Sign in with Twitter </a>
I really like Samuel Marchal’s Generate Your Own Bootstrap Navbar website. If you’ve ever wondered how to customize a Bootstrap Navbar, the site explains it. The site also lets you customize your own, picking colors and generating the SCSS, SASS, LESS and CSS. It’s super cool and easy. His website is full of extra tools.