Cascade by Tycho, from the free Ghostly Swim compilation put out by Adult Swim.
Scaffold is a new Tumblr theme by Mike Harding. The theme includes support for a custom header graphic, colour settings for icons, divider lines and Vimeo controls, and also offers Twitter and Google Analytics integration.
Available now from Tumblr’s Premium Themes area.
For a full list of options available on the Scaffold theme, check out the options page.