We finally posted our proposal for a Drupal Seven style guide, after lots of discussion and iteration it's now at a point that we feel it reflects our idea of Drupals branding.

The goals of the style guide are:

1. Identify Drupal core values that we can use to determine the look & feel for the Seven theme.
2. Unify the visual language in Seven and ensure the overall look-and-feel supports the core values.
3. Identify the visual and UI patterns used by Drupal core so that they form a conscious, shared language for us to built upon.
4. Provide guidelines and rationale for others (e.g. contrib) to build upon as new interactions, styles and platforms emerge.

This proposal will require quite some discussion, but hopefully after that we can document it and bring this into core. With cleanup phase coming up we can now focus on consolidating all the different styles that were brought into Drupal 8. Creating this style guide has been a tremendous effort, of many many hours by the team, totalling 5 full iteration rounds. A great deal of appreciation should go to Ryan Fredrick (ry5n), for taking a leading role in making this happen.

Below you can see all the patterns below each other, the style guide captures all the rationale behind each of these patterns.

We are looking forward to your feedback in our style guide proposal!