We keep suckling on Cities: Skylines news teat, because a) it's good, b) it's doing well—having just broken the 500k sales mark—and c) it has mod support, and so has a community that's consistently pumping out great stuff.
For instance, right now on the Steam Workshop you can find a couple of buildings from Bryan Shannon—a former Maxis employee who worked on both SimCity and its expansion, Cities of Tomorrow.
Whatever you think of SimCity—and I know what you think, I have read the internet—it was a beautiful looking game. That's reflected in Shannon's buildings, which fit nicely into Skylines' aesthetic while experimenting with its look.
"Overall, this coal power plant is a deviation from the original style," writes Shannon of his coal power plant. "This asset introduces a nice dirty brown brick in to the game's overall neutral palette."
Update: Shannon is now on Patreon, taking pledges to fund his work inside of Cities: Skylines.