My coworker and I were discussing how it would be super helpful if you could change the colour of "cards" or "tasks" according to lists. Right now you can assign a colour to a list, but it doesn't do much beyond that. If you could make it so while viewing a whole project each task had a colour according to its list, it would make it much easier to track progress. Whether the whole background changed colour, or you made the borders of the tasks change colour, it would be a super useful feature. This is specifically related to board view, but could potentially be applied to box or list as well.