My Arduino projects tend to quickly get quite messy (see attached picture for an example). The sturdy Dupont cables can cause different modules to collide, and even though it hasn't happened yet, this is a potential danger of damaging the delicate electronics.
So, my first idea is to create an interface part to safely attach an Arduino to a LEGO (R) baseplate (or the body of a LEGO robot).
My second idea is to create a LEGO compatible holder for external Arduino modules, like relays, sensors, RTC, you name it... This calls for a standard hole layout for modules. If the manifacturers of modules could stick to multiples of the LEGO stud distance, then all we need is one standard Arduino holder (4 holes) and a one hole support for the external modules (would normally take four of these to secure one module).
Or is there already an existing system to straighten up the projects?
