Flaming Equipment

Fist weapons naturally glow. That's probably what you saw.

Imbuing shards at armors, every shard glow on a different colour high level shards glow with an electric effect like Immaculates
Some weapons u gain as a rewards from quest glow too and the TT's too

U can check the imbue guide here: http://pwi.perfectworld.com/guide/imbue