Hey everyone, just wanted to write back and mention to the community that his themes work! This is really incredible, @s40in!
I followed the advice and searched for ‘haki’ in the Depot after adding the repo, and there it was! 
From there, I got to play with a few of the decors and control looks – these are super cool! Reminds me of the fun decors that Dano used to have! I first tried the game decor (I got the M and L reference after seeing the red and green) 
Awesome!
“Next” stop (pun intended) 
was the NS theme. Now, everyone in the community knows I’m a Mac/NS lover as well as Be, so seeing this one was super cool! 
The square look and medium grays of Haiku’s default decorator goes good with it too.
I also tried out the CDE theme – wow! This looks righteous as well!
And heck, just for the fun of it, I gave in and tried out the Win16 theme, and hey, it looks kind of like Redmond’s 3.x stuff actually. 
But my favorite one I tried out (saved the best for last) was the Hakilo2 and HakiDecorator. These are really nice! I instantly saw some Dano inspiration in here!
Add a dash of Dano’s lavender blues in there (RGB: 118, 120, 184… iirc), lighten the grays a bit, and voila! Definitely keeping this look! (I love how it merges the good parts of Origin with the classic BeOS/Macintosh close buttons, btw).
Definitely recommend everyone tries out the themes from @s40in! This is my first time giving them a whirl, and they’re really cool! Kudos and thanks for creating and sharing them! 