Where is the documentation page :-p

(
the text below is not complete correct but it's a start:
- the images folder has an incorrect path (should we copy the images too?
)

Creating a sub theme

Follow the instructions on Creating a sub-theme

Next add all theme settings from at_panels_everywhere.info. Those settings are needed to get rid of the errors when missing.

; see http://drupal.org/node/225125 for sub theming a sub theme

name = Sub theme Adaptive Theme Panels Everywhere
description = ATPE super duper theme
core        = 7.x
base theme = at_panels_everywhere

stylesheets[all][] = custom.css

;----------// Theme Settings

  ; Layout settings - Standard layout
  settings[bigscreen_layout]         = 'three_col_grail'
...

Make sure to add the release to your theme.

This is a little weird but you need to add

release = 7.x-3.x

to a subtheme. When checking the " Sub-theme compatibility test " the follow appear.

The version of your theme (koc_atpe) is not designed to run on Adaptivetheme 7.x.3.x. It will probably run, but your experience will not be optimal. You have three courses of action to choose from:

    Downgrade Adaptivetheme to 7.x-2.x
    Upgrade your theme to the 7.x-3.x branch — you will need to check if an upgrade exists.
    Add the line "release = 7.x-3.x" (less quotes) to your sub-themes info file and clear the cache to make this message go away.

You can turn off this message in the Debug settings, look for "Sub-theme compatibility test".

The subtheme must add breadcrumb settings too.

Does this means all settings from the http://drupalcode.org/project/at_panels_everywhere.git/blob/refs/heads/7... must be copied to the subtheme file?

(xref for old bug hunters)
#1535852: Missing breadcrumbs after moving to D7
http://drupal.org/node/1497224#theme_breadcrumb%28%29

The edit form for breadcrumb still misses for my subtheme (and prob. adaptivetheme too)

@Jeff Burnz: how should one ie change css styling or add template files?