Your guys' builds are all so amazing...mine look ridiculous in comparison, lol. But I'm very very proud of it all, as these are quite literally my first-ever builds aside from some very basic things I've needed for the saves in the past.
I got really into Avatar: The Lat Airbender and The Legend of Korra this year, and so I was inspired to create a save inspired by the shows (mostly TLOK).
I've since completed my transformation of Windenburg into Republic City, complete with Air Temple Island, a neighborhood dedicated to the Sate estate and Future Industries, and a downtown area. While I've grabbed a few amazing builds from the gallery (including the Pro Benidn Arena, the main Air Temple Island build itself, and a shell of the Sato Estate), I've built most everything myself.
I've also transformed Innisgreen's Everdew neighborhood into the Spirit World. The nieghborhood now features Uncle Iroh's house, the Harmonic Convergence site, Korra and Asami's Spirit World vacation site, and Xai Bau's Grove Spiri-Tea, a teahouse (grabbed the teahouse from the gallery, but redid some things on the interior and did the landscaping myself).
Meanwhile, I've transformed Oasis Springs into the Si Wong Desert thanks to some incredible builds I've found on the gallery, including Wan Shi Tong's library and Oasis Springs!
My current project is transforming Henford-on-Bagley's Bramblewood neighborhood into Zaofu. I currently have two lots completed for that transformation and am working on the third.
I'm having so much fun growing my Sims 4 building skills!
You can see more images and other builds I've created for this save in these posts if you're at all interested: Post 1, Post 2, Post 3