I was going to say the same thing. It really does glow!
I'm not sure how it would look but you might consider making a narrow flange from the scraps you have left over & then adding a black border beyond that & then binding in black. Not sure if that would change the whole dynamics of the quilt or not. If that would not enhance it in any way I would just bind it as it is. It's very, very pretty just like you have it now.

Looks good without a border.

Just this morning before reading your post I thought about a flange. I've never done one before but happened to see a tutorial in a Fons and Porter magazine on making a faux flange binding. I'm not sure what the difference is between a faux flange and a regular flange but I just might try it. I even found some fabric in my stash that I think will work out.

well I like it the way it is!