Things They Should Invent: Urban landscaping based on leaf colour

I grew up right under the Niagara Escarpment, and every fall around this time we'd get a full blast of various different colours of trees. Now I'm in Toronto, and when I look out my window the only colour I see is yellow. No beautiful reds and oranges, no giant flame-like progression.

So I propose that when planning what kinds of trees to plan in urban areas, they should take into account the need for an attractive variety of fall colours.