I laugh at your white four way mains, I use a white six way . . . ha!
To be fair though I use one of those aluminium hop-up things to put my amp on, I put a black flag over it before the amp goes on and then tuck all power leads, cables etc underneath out of sight, even my pre amp pedal goes under with just the mute switch poking out so I can access it if needs be. All the audience sees is an amp with one cable coming from under it.
I like to get pretty active on stage and cannot stand cables under my feet, when dragging a doublebass around you really don't need cables getting snagged on the endpin.
All cables for the rest of the band are as others have said, behind the blackline, between mic stands and monitors at the front and up the sides, leaving a nice rectangle for performing in.
I also can't stand all the cases being piled in a corner, GET RID OF THEM.... and breathe