See you Saturday!
Messy and Neat Freak.
Easy, have things be placed in piles of mess, but have them be in very specific piles of mess.
So organized chaos? That's actually a classic 'creative mind' system.
While I tend to be more analytical than creative that is pretty much my organization system. Though I tend to toss said piles into boxes/drawers/corners... works great for commonly used stuff but causes a bit of a problem for rarer stuff that winds up on the bottom.
Have them completely disorganized from the second level down but in spaces where they are not visible. Like a drawer for shirts, socks underwear, another for pants and stuff while your study materials are piled on top of your wardrobe and your floor is completely clean.