When I buy parts from a Bricklink store, I will often browse around to see what else they have which is of interest. This happened recently, when I found 14 Olive green pieces, more usually used for the front of cars: the catchily-titled “Wedge 4 x 4 x 2/3 Triple Curved”. They were very cheap, so I put them in my basket too.
Once they arrived, I didn’t even bother putting them away, I just decided to build something with them as roof pieces. And so emerged Frogmore Gardens, a residential block set around a large pond with decking out the front and a few moisture-loving plants at the rear.