If I understand, your talking about, say, crossing a daylily to a delphinium to get a blue daylily?
I don't recall hearing of anyone crossing a daylily to anything else, but I have wondered about it. If we could get delphinium blue, impatient pinks, pansy purple, etc... It would certainly change the daylily as we know it.
Would this be actual cross breeding, or more like genetic splicing?