Fantastic Fringe is a super parent for the toothy sepals. Looking at that site I see a few others that have toothy sepals. That is something I have been looking at also as it adds so much to a bloom that otherwise the sepals are just there and adding nothing to the bloom itself on certain forms. They can be stunning on other forms without all the extra but one needs to pick and choose what looks good. I don't think a toothy sepal would look right next to ruffles or straight edged petals, but maybe it will be the next newbie.
Sepals, another thing I look for in an eyed or patterned daylily is the eye or pattern being repeated on the sepals along with the same petal edge. Makes it so complete.