I thought I'd play around with this photo of Brian and Dianna in London. I cropped it to just focus on Dianna (sorry, Brian; guess the truth is out about who's the favorite. Just remember you both complain about photos posted:) )
I wanted to try the stuff used for "urban backgrounds." I duplicated this, switched to "lab" mode, multiply blend layer, reduced the opacity, masked back Dianna's face & hair,and I switched back to RGB mode. Then I sponged, increasing saturation in areas I wanted to intensify.
I added a warming filter, and then burned the edges a bit.
It was just fun to play with!