Yes, I know, she's filthy. Anyhow, my first crack at doing taillights.
I did not feel confident enough to go to town on my existing ones, so I picked up a used set on ebay for about 60 bucks. Cutting them open was pretty easy. I gutted the inside electronics, but kept the middle plate because of what went inside.
I'll openly admit to being a cheapskate in some cases. Dropping nearly a quarter of a grand on 4 rings that light up red and blink - that's pretty far up towards the top of my list of insane choices. So, amazon halos it is then.

The negatives: Probably not as reliable, definitely no warranty to speak of, and absolutely no driving modes. As in, a single circuit, on or off.
The positives: COB leds, bright as bright gets, and the best part - these are 12-14 bucks a set. So, I bought 5 sets.

The outer, larger assembly consists of 3 halos, 120, 110 and 100, nested perfectly like russian dolls. The inner is a set of 90 and 80. By the way, these are the 5mm thin kind.

I am also not a fan of the idea of having one light source for every possible function, so I did not want the halos to be the turn signals. Especially when there is a perfectly good location for the turn signals from the factory.
So I went ahead and drilled out the centers of both inner lights and installed a matching set of 2 red 7440 leds in each taillamp. Which is where the center plates come in. I cut slits in them to act as sockets for the secondary TS, and it worked perfectly. Too bad I couldn't catch them in the pic

As to the halos, the 120 and the 90 (the outermost ones on all 4) are set up as driving lights, and the 110, 100 and 80 are the brake lights.
The pic is for comparison, retrofitted vs. stock.

Thanks for reading