Use colour for quick grouping
Household members, school subjects or zones can use a colour cue.
Keep text labels too
Colour alone can be ambiguous and inaccessible.
Limit the palette
Too many colours create another code to memorize.
Do not sacrifice fit for colour
A useful container matters more than a matching one.
Practical boundary. Measure first, respect product load limits, and do not improvise wall, ceiling or overhead installations when the structure or appropriate hardware is uncertain.