This is a rather close visualization of how I imagine the Anaden Gateways looking. It's not dead-on - the Gateway rings are smoother (so Eren can run on them, obviously (see the Re/Genesis short story)), the plasma is amber (only the Kats' Mosaic gateway is icy blue), and based on the traversing ships, the Gateways are much larger, but on whole...yeah.

https://www.deviantart.com/redwoodjedi/art/Jump-Gate-905088441

Originally posted on Facebook.