Noah, I've had many (too many) ideas about speaker styling, but it had more to do with adorning box as opposed to creating a functional horn or something that would alter designed acoustics.
I can't see the space you're dealing with, but perhaps something with a medieval vibe, like metal straps and big rivet heads. Make speaker stands look like swords or perhaps a sword appearing to skewer the speaker if you like the whimsical side of things.
That's just me, though. I love thinking about stuff like this but alas the audiophile world is far less eclectic in my experience, so it will fall short in that regard. I'm tempted to make a video of something like this, but it seems that type of subject matter is the least watched on my channel, so I question the appeal.