There are many effects you can produce in the digital darkroom and one of those often used is cross-processing. This is an effect produced when print film is developed using chemicals for slide film, or vice versa, the result being that subtle shifts occur across the colour curve. This is easily replicated using image editing software.
If you hover your mouse over the photo above you’ll see both the treated and untreated image.
As well as the shift in colour, I’ve also added a vignette and softened the edges of the picture, a characteristic borrowed from Lomo photography.