Here's mine, sorry about the mess, I am tearing it down, and I just got in a bunch of clowns...
I'll walk you through it:
It starts with the sump and fuge from my 220 (upstairs)
Then moves onto a small softy grow tank
Then two low boy frag tanks
Next is a 70 gallon frag tank, with a 5 gallon in front, the five gallon just houses a clown goby with a pistol shrimp.
Then a 90 gallon display tank (which is plumbed with the 70 gallon frag tank)
That little 10 gallon near the floor is a breeding tank for pseudomugil cyanodorsalis.
Then a fish wall, which mainly houses clowns or serves as QT when I need it... Combined, there are about 200 clownfish in those tanks...
I hope that gives you some ideas on the endless potential of a fishroom.