Concrete only tends to look decent in the first 1-2 years when it has that sculptural, "fresh" look. After that, it tends to look generic and dirty.
...as the large and aging concrete structure in behind aptly demonstrates.
I have sometimes thought (at the risk of being labeled a heretic) that the CN Tower would be greatly improved if the bare concrete were covered with a pure white cladding of some sort, perhaps ceramic tiles.
The CN Tower's concrete is also starting to look badly discoloured. It looks like a few, bad patch-up jobs took place.
^^ Pale blue would probably look very nice all along the gardiner; refelecting the nearby lake.