Now that sorting has been implemented, see Sorting Announcement, I would like to propose a feature for some refinements.
I would like to sort my lists by colour label. The colours are already numbered 1 through 6 plus no colour. The labels can be used as the order for ascending and descending, and personally I would always put no colour at the end of the list.
Within each colour, i.e.: all items with the same colour label, I don’t really care about the order (for me colours are a priority indicator) but it could simply be by date created or by the previously applied sort order.