Feature Request: set colors for tasks within lists

A feature I keep expecting to see but never shows up! Allow the ability to change the background color of a task within a list for quick access/reference.

Ie. For my grocery list: what if the list contains items for different stores. I don't want to put "store A" and then have a sublist that I have to drill down in to. I want to see it all in the main list so "store A" items are pink. "Store B", blue, etc that way if I see an item from the B list while in store A I can mark it off! Or, all my dairy items I mark blue, all meat red, etc. So if I am in those sections of the store I can see quickly what I need from there without scrolling the whole list.

Same with my hardware store list... Ok electrical section blue, plumbing red, etc. 

Basically, allow changing the background color of individual tasks within a list.