Flags of Germany in an alternate timeline where Frankfurt Parliament succeeds and Grossdeutschland Federation is formed.
The new state chooses to use the Jenaer Students League's flag (which was the first flag to use german liberal colours) as its national flag and coat of arms (Gules, a fess Sable, an oak branch Or).
The eagle stays two-headed ofcourse, as a reference to the HRE, or the dualism Austria-Prussia, catholic-protestant, etc.
The text in German says (thanks Sapiento) that the first row of naval flags is used in inner waters, while the second row is used in open sea.
The three flags in the last row are the flags of the President of the Republic, the President of Bundestag and the Chancellor.
(I don't have idea how Grossdeutschland could evolve into a federal Republic, but well...)
Comments and critiques are welcome!