JoomlaBamboo has released this Zen Grid a template framework to start build your own minimal template design from scratch.
This template is suited for template developer who wants to get complete control over all aspects of layout and styling.
Zen Grid is not a real blank template, it's already equipped with JQuery Superfish Suckerfish Menu, JQuery accordion-like panel menu, hackless cross-browser compatibility etc. JoomlaBamboo also offers a quickstart package of this Zen Grid so you will have a demo version to get start.
So if you're a designer/developer you should Join Joomlabamboo to get this framework. Take control all aspect of your own template design!