I'm guessing it's hardcoded, but is it at all possible to make your own glow colors?
(I don't even know why I ask this, i know the answer is no)

No, but it is possible to add your own glows. The only time this doesn't really help is when you have a particle with a trail and you want the whole trail to glow. You can only achieve that with the specific glow colors, and not to any great extent.

At the moment, I don't know what the colors are. I think there's a blue and, like, three shades of yellow/gold. Somebody else can probably tell you.

If they're feeling generous...

Ya, it's a blue glow, ggold, and light gold.
Thanks for the help Darlos!

The glow colors I put on the Wiki's modding page, and are also on my tutorial thread.

But how do you make new ones?

Actual large glows or glow colors that are used for pixels?

I know exactly how to make actual large glows, but I meant pixel glows.
It isn't possible, is it?

No, it isn't.

K, just checkin