I agree, a dozen or so pre-made and officially maintained themes would be stellar.
@scottalanmiller Agreed! We would love to partner with some designers to create a set of maintained themes based off of Persona.
In the meantime we have Persona, Lavender, Vanilla, Slick, and Material (though Material is actually a third-party theme).
Finding the designers is the hard part, as well as identifying potential stumbling blocks for said designers.