I don't have a picture, but what we did with all our cords to tidy them up was first mount our three power bar/timers to the wall like so:
[o : : : : ]
[o : : : : ] =wires here= (Tank sits to the right of the power bars & ballast)
[o : : : : ]
-----------
MH Ballast (on the floor)
-----------
Any cords that are too long are wrapped & tied, and everything running from the power bars is tucked as neatly as possible behind the tank. Nothing fancy, but the power bars being mounted on the wall away from the tank and the wires running from the bars to the floor and then up to the equipment means that any water that might potentially run down a wire will never make it into the electrical outlets. The power bars are visible, but we like it that way so we can see the timers and easily access the plugs if we need to disconnect something.