Here is mine. Certainly not as fancy as some you will see on here, but I like it.
It's a 50g sump filtering my 220g tank. It is fed by 2 1 inch drilled holes.
Only one of these massive pumps run it at the moment. As you can see the valve on one is shut off. I have a 4ft UV filter that I will hook up to the other one of these days and add some extra jets to the tank.
The cat is my wife's. He doesn't really do anything for filtration. His job is mainly to be in my way and get on my nerves. I must say, he's good at what he does.
Last, but not least (to me anyway) I have it pumped through a secondary filter before being returned to the tank by the jets to catch any fine particles that the sump may miss.