I would use an exotic armor piece that would actually help me out a bit, but I don't want to break my armor's aesthetic. If I could use a legendary ornament I'd be very content.
EDIT for all that don't know what grass is: Even if it means giving a PVE ornament slot and a PvP ornament slot (only ornaments for the armor piece) that would work. I just want to use an exotic without ruining my look.
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I'm totally ok with it as is, or done that way as well. Plenty of games like this; Diablo for example, allow you to change the look of all armor, legendary/exotic included. We all know the true core of Destiny is looking awesome.