If windmills were festooned with ribbons, balloons and sequins maybe they wouldn't look so unattractive.
Perhaps we could look to The Dutch for some guidance here.
Maybe something involving tulips could be considered . . ?

If one was able to install some sort of "seed dispenser" on the windmill, one might even be able to do something about the excess bird and squirrel populations. Of course, this could negatively impact the aerodynamics of the blades, but this is a small price to pay.
(Not counting the opinion of the birds and squirrels, of course.)