I don't think Baptist fan is boring at all. Or did you mean it's boring to work on? It's certainly not boring to look at.
I would only add borders if I wanted the quilt to be bigger. I agree that if you add any it would be nice to have a thin inner border (black would be nice) and then another border, which could be checkerboard or piano keys. I don't think this quilt would look quite right with a solid color on the outer border, but that's just personal preference.