I'm working on a World Generation Project in Unity!
I began working through a bunch of tutorials and information about creating terrains in Unity with code, instead of by hand.
I then got that code running as co-routines (somewhat) so that it could generate them at runtime, before your eyes, rather than only in the editor, or all in one frame (freezing up the realtime aspect while it did so).
Here's a video of my island generation working in realtime for the first time.
"World Generation in Unity - Generating Islands at Runtime"