Can't speak for the other folks idea about form, but for me: big, ruffly, round with closed standards. If an iris has those attributes, I love it in any color, and would love it if it had broken color too. Broken color as a term covers a lot of things - I do think the color of Peggy Anne is nice, kind of like a marble or maybe a bowling ball. I am not a fan of historics but for someone who is, the form disappointment would likely not be present. When I first got into iris, I was fascinated by the broken color, but as Derylin said, that passed rather quickly. Luminatas though have always remained the coloration that I can't resist. I suspect the form development is slower because they tend to lose the pattern when outcrossed with non-luminatas, based on the fact that I see the same luminatas in pedigree after pedigree. I ordered Moonglint this year, and am looking forward to seeing the form of it.