Adjustments layers and colour curve levels
Adjusting these allows you to subtly change the colour saturation, colour connotations and it allows you to give your image a hue. It gives your photo a kind of retro look as it was used in the 1980's to expose film.

Cross processing-create a new film or adjustment layer- curves-drop down menu-use the graph to alter the coloours. Red move the lins to create a kind of s shape, green shorten the line and blue again create and s shape. then create another level, go to adjustment layers and add a dolid yellowy green colour and change the capacity to around 10%