Well, I'd been planning this for a long time, but never could do it. Why? I didn't know what needed to go in the VMTs. But now I do. I've never seen a single spiral skin for this released yet, so why not be the first. Yes, this is based off the beta one LOOSELY. It's meant to be more like the current portals than the beta. I made the actual spiral in a matter of about 3 minutes, so don't expect it to look great, or just like the beta. It's similar to the beta, but not the same. If you want ones like the beta, download the Gmod Spiral Portals released by Hunterbrute. Each texture contains a total of 37 frames that had to be rotated on a frame by frame basis in order to make it look good. That took around an hour. It's also UNRELATED to Project: Beta.
Anyway, extract to portal, merge if asked.
I managed to fix the ugly look the spirals had. That was my own goof-up, and I hadn't noticed it before. It's smooth and nice lookin' now, though.