I'm all for a slight glow, aura, pulse, what have you as long as it makes sense. Something like the Flametongue certainly should have had a better look than it currently does and a slight fire aura of some kind would make sense.

I don't think anyone really wants ridiculously bright glowing weapons to the point where you can't actually see any detail on them due to the overpowering light. I think aura lines, slight glows or other similar things would be fine where applicable. Unique or elemental equipment.

Speaking of glowing things though, I wonder if we'll be able to see materia slotted in anything. It would be interesting if there was some kind of visual cue, maybe not even that extreme. I mean we already have the gems showing in the rings.