Bismuth

After using various approaches to theming different sites (base themes, starter themes & custom themes from scratch) Bismuth* was my first stab at a base theme.

It is an HTML5, source ordered theme with some mobile optimizations out of the box.

I'm working on D8 branch which will obviously have to be significantly reworked for Twig.

*The name Bismuth was chosen for it's striking crystalline structure, which forms a lattice of nearly but not quite perfect 90° angles. There seemed to be a metaphor in there about the nature of theming, and coming up against that last pixel.

Bismuth is also -somewhat surprisingly- the heaviest non-radioactive element (which is not that 'heavy' is something you want in a theme.)