I haven't actually got mine set up yet so I can't share pics, but I have small hooks on the inside of my stand for all my cables. I'm also going to get some small stickers and place them a few inches apart along the length of each cord and colour code them with another label on the power point so I can recognise which cord is which without having to trace a cord to the device or power point. That, along with some rubber bands to keep everything together and out of the way will hopefully give me a nice, tidy space in my sump :)
As for the plumbing, I only have 1 pipe for my drain and a flexible hose on the return, so I can't do much to manage that haha.