i do practically the same as persianista: Put them in order of colour familes, but i get a bit ocd, it had to be of the same order as the colour base as in the colour chart. When i used majirel, i used to put it in order of red, copper, warm brown, cool brown, burgundy etc
So i use matrix where all my quasi colours are first, then my extra coverage grey colours then my normal tints reds, high lifts, ultra blonds, but in order of neutral, ash, gold etc.
I get all my hairdressers to rip off & put it in a little bowl, or if half used/quarter used, to mark it one on the tube cover (cont: 1-2-3-4) so i know, plus coz its in chart order, makes it easier for me to have a quick glance if it is in stock or not! xoxo