Allow for both creation and coding of color tags.
I would love to be able to individually color the 'cards' according to categories I set, AND have a color (bar or frame) that can be tied to priority or lateness to help the visual folks get a handle on things
Quentin Jackson commented
Agreed. Particularly if those colours sync e.g. to Microsoft Exchange category colours. My Vote added. I have a lot of tasks and this would enable me to skim them in the all category.