The Swirl Portals from Portal during its development. These are from 2006.
To install, you must first decompress the the Swirls.rar file. Then if you haven't already go to C:\Program Files (x86)\Steam\steamapps\common\Portal\portal (or where ever your portal is installed) and create a folder called "custom" without the speech marks. Like so: C:\Program Files (x86)\Steam\steamapps\common\Portal\portal\custom You then drag the Swirls folder in there and everything should work fine.
do they glow?
I'm not sure I understand your question. The Portals do not emit their colours on the nearby geometry if that's what you mean, but they appear bright as if they are glowing.