For some reason I'm able to get back into my Ideas account, after five years. Let's get back to finding cool sets to support!
Dragon Designer -- Cool colors and tons of parts.
Martian City -- This would make for great nano-scale terrain.
Micro Worlds -- Might be cool as oversized Stations.
Mecha Dragon Statue -- Should have a ton of good parts.
Modular Knight's Castle -- Who doesn't want two castles as terrain for their game?
Baby Dragon Fortress -- More terrain and some fun bits.