A frame within a frame - or how to paint a rented apartment

I really like the way that white walls are brightened up by double framing prints and painting the backgrounds different colours. It'd work brilliantly with modern monochrome prints and if you used the backboard of the largest frame to mount the smaller ones upon, it'd be a brilliant way to add colour to white walls in a rented flat. This example is taken from the Portuguese rental company The Lisbonaire.