HTML Examples. CSS Generators. CSS Things. CSS. CSS. Creating a custom HTML theme. Want to create a custom look for your blog? If you’re comfortable hand-coding HTML, then you’ve come to the right place! If not, choose from hundreds of beautiful themes in the Theme Garden. Introduction Tumblr is built around seven key post types: text, photos, links, quotes, chat, audio, and video. Be sure to customize your theme around these types so that your posts show up beautifully on your blog, on the Dashboards of your followers, and on other blogs when they’re reblogged. Free Webmaster Tutorials - Quackit.com.