Bougainvillea leaves

Seen a lot of different coloured Bougainvillea plants over the years - the colour of the leaves, that is. Pink, red, white, crimson, purple, yellow, cream and orange. Believe there are a range of cultivars that sport variegated leaves as well.
This plant trails over the fence from the next-door neighbour's garden.
Attractive enough, if you can overlook those vicious thorns on the stems/branches, and the yellowy/orange leaves really steal the show by almost completely overshadowing the tiny white flowers enfolded inside.
But this plant is a little different, in that one of its branches - and only one , of many - has both fully yellow leaves and fully red ones too.
It's not like one is transitioning to the other - both lots started out their growing cycle in exactly the same colour as they are now. So it might be autumn down this way, but these are definitely not autumnal leaves.
Bougainvilleas are supposed to be evergreen where there's rain all year, and deciduous where there's not.
Must've been an excellent adaptation to the hot, dry Australian summers in the south, because I don't think I've ever spotted one losing its leaves in any season.
Very tough plants, too, and can thrive in a wide range of soils and climates - even salt-laden coastal areas. A lot of native plants really  struggle to grow in such areas, so for an exotic to be absolutely thriving in them is quite a botanical accomplishment. 
They don't need a lot of water, and you can easily propagate them from a cutting thrust willy-nilly into the soil. If you want to - but with those nasty spikes, who would?