Of course, bougainvilleas. I see that multi-colour isn't unusual:- (from Wikipedia)
"The actual flower of the plant is small and generally white, but each cluster of three flowers is surrounded by three or six bracts with the bright colors associated with the plant, including pink, magenta, purple, red, orange, white, or yellow".
Originated in Brazil but now found the world over. They were particularly common in the Cape (South Africa) when I lived there, and I've seen some lovely specimens on the Florida Keys.
Anyone know the best way to source/plant/propagate them? I think a couple would look good at my house.