The amount of cables and power supplies tends to explode as bassists or guitarists get more and more effect pedals. So I thought I needed a pedalboard, one board to contain all my (frequently used) effect pedals, power supplies and wiring.
I found a thread which contained a build report for such a pedalboard. This was all my father-in-law needed and started doing all the woodwork for me (as I don't have the necessary tools). I finished it off with the Velcro strips, the power supply and an A/B switch pedal which also functions as the power supply for all the 9V pedals.
As you can see, there is still some space left for extra pedals :)