I like the fx changes on sets, since it adds a theme to the items. I think Runebinder having a purple fx change to Rune of Hagarrad and/or Kalastor would be a nice addition to the set or if a new item was added that gives the fx and can be used with Runebinder set (gloves making the most sense, since Martin’s Crest).
Additionally, the fx changes usually seem to be paired with a conversion and Hagarrad is rather lacking in ways to convert away the pierce so a source of pierce to elemental would be welcome.