Customizing Portals

It would be really cool to be able to customize portals.

for example, placing a portal with the swirling animation but have a custom image of the "world" the portal goes to be the disrupted visual rather than just a see through of whats on the other side of the environment.

Also some kind of customization to portals like adding your own portal effect animations or color sliders for the existing animations to change them around to meet the "vibe" of what you are trying to do with the scene