The Nanyang Art School in Singapore: Not overpowering or separate from its environment but assimilating, like a good guest. As other architectural trends go long past their expiration dates, this building will likely remain as fresh as the evergreen fescue that covers it. Nature does that.
Garden styles may trend but they never date.
Picture and source Inhabitat.com:
The roofs create open space, insulate the building, cool the surrounding air and harvest rainwater for landscaping irrigation. Planted grasses mix with native greenery to colonize the building and bond it to the setting.
(The title is taken from Grass (1918) by Carl Sandburg.)