when I did the physical bit (a Moog Modular synth), I'd just make up some basic controls or connections (1 jack, 1 switch, 1 knob, etc), and duplicate the #$%^ out of them..;) place them to suit..again, it's personal taste, unless you're modelling something someone else created
Okudagrams (the Star Trek control surfaces) were designed to be like menu screens, there's a long explanation of them on the various sites out there devoted to LCARS.

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)