Thanks a lot to everyone!
Also, my good resolution for 2017 is to share my Unity stuff publicly, and I'll start with this Portal. Here's a Unity package that contains everything you need to play it: meshes, shaders, textures, etc. Keep in mind I did not do an optimization pass on it, so shaders are not really the best, and some textures could definitely be in lower resolutions... So if you plan to use the resources for an actual game/project, make sure you optimize them first.
To play the animation, just press the space bar.
And as a small bonus, here's my current VFX for Hextech Anivia's ultimate, directly derived from the Portal:
You're free to use the resources there for whatever reasons. Feel free to tell me if you use them, though, or if you have a problem with them.