Here's the concept work I did for PROJECT: Mordekaiser. Pretty fun skin, a lot of space to work with since his ult is a full environment swap.
Check out the awesome model by Kevin Jones here: https://www.artstation.com/kjones

Making the Project city for his ultimate was quite a fun challenge. Here's an early mockup I made, you can see it animated here along with a great breakdown by Sirhaian (audio warning!): https://twitter.com/Sirhaian/status/1398021658108071938?s=20