Originally Posted by
fordgt40
The electronics do not know or indeed care what colour wire you use :D
Logic suggests you use a colour such as black for grounds, and use the same wire type for all electronic signals ie inputs/outputs. The wire in the link is solid core and keeps its shape when bent, also cannot be bent too many times. If you want flexible wire then just choose a multistrand type of the same thickness or slightly thicker. Remember that power supplies eg 5 volt may need slightly thicker wire to avoid voltage drop on long runs