Did any of the EU material come from George Lucas?

Question

Did any of the EU material come from George Lucas?

More specifically, were there any details or facts or events that were:

1. NOT covered in G- or T- canon works at all.
2. NOT designed to set up something for the future G or T canon works.
3. Included in C-canon works (aka Extended Universe).
4. Were explicitly known to originate fully from George Lucas (e.g. he told/suggested the book author to use a specific idea/fact/event/character). Not "approved" by Lucas, but "invented" by him, for lack of a better word.

NOTEs:

• Yes, I'm aware that things stated by Lucas automatically count as G-canon even if included in overall-C-canon works. The question is about such facts.

• I'm obviously excluding movie novelizations entirely. They mostly fall under #1/2.

• Yes I'm aware that as of 2014, Disney intends to make canon changes. This question pertains to pre-2013 canon rules.

Answer 1

By definition No, the "G" of G-canon state for G eorge Lucas

G (George Lucas) canon is absolute canon. This category includes the final releases of the six films, the novelizations of the films, the radio dramas based on the films, the film scripts, and any material found in any other source (published or not) that comes directly from George Lucas himself. G canon outranks all other forms of canon.

-- Wikipedia article about Star Wars Expanded Universe, Official levels of canon section

And

G-canon is George Lucas Canon; the six Episodes and any statements by George Lucas (including unpublished production notes from him or his production department that are never seen by the public). Elements originating with Lucas in the movie novelizations, reference books, and other sources are also G-canon, though anything created by the authors of those sources is C-canon. When the matter of changes between movie versions arises, the most recently released editions are deemed superior to older ones, as they correct mistakes, improve consistency between the two trilogies, and express Lucas's current vision of the Star Wars universe most closely. The deleted scenes included on the DVDs are also considered G-canon (when they're not in conflict with the movie).

-- Wookieepedia article about Canon, Canon in the Holocron continuity database section

Answer 2

According to IMDB,

• Lucas was a major writer for Star Wars: The Force Unleashed,

• The creator of the unreleased Star Wars: Detours (which has its own canon level),

• A writer for Star Wars: Shadows of the Empire,

• And a writer for Ewoks: The Battle for Endor.

There are also dozens of examples of him being credited for "Characters" but I assume you don't want those.

Answer 3

The fact that Darth Plagueis was a Muun was not covered in G or T canon, but made part of EU C canon by Jedi vs. Sith: The Essential Guide to the Force, and later by the novel Darth Plagueis. In the Behind the scenes section of Plagueis' Legends article on wookieepedia, it says it's been confirmed that George Lucas came up with this fact:

A panel on continuity at the Celebration IV convention revealed that his identity as a Muun had originally come from George Lucas.