My final suggestions: The truly crazy ideas
More Transformers: Grimlock is a good start, real good, but I have a few favorites of my own to try. Even if we just stick to G1, I have a few of my favorite Decepticons that I'd like to secrete into the setting.
Superior Defender OG Force: A mad suggestion by someone on the last thread, the idea of sentient OG mecha, possibly sized to their Endless Frontier sizes, attempting to save Princess Valsione from her evil father and his goblin-eqsue Divine Crusaders...It works too well. Plus, it allows us to have a full-sized Grungust as the Final Godlike Weapon that we can appropriate...for certain purposes.
Macross 2 Plus 7: Again, it seems I'm the only person in the universe who likes Macross II. Something about the Marduk always resonated with me more than the Canon Protoculture or the Robotech Master. But why simply redo another short OVA that had good ideas and didn't use them, when we can have it both ways? Slip elements of other Macross series into the proceedings, such as certain duo of asshole pilots, and a certain band, and we could have something...
40k: Not the whole setting of course, but a single piece of a single world, mostly likely a hive city, with a Titan or two to make things interesting. It can't end well, but then, what can in this world?
And finally, the true proof that I am completely insane...