Now the skin is the right color, but I want the background to be less yellow. Create another selective color adjustment layer.
[REDS] Cyan: -100 ; Yellow: +100 ; Black: +100
[YELLOWS] Cyan: +100 ; Magenta: -50 ; Yellow: -50
[CYANS] Cyan: +100 ; Yellow: +100
[NEUTRALS] Cyan: +20 ; Yellow: -20
>>
Now we got the nice blue tones but lost the saturation. Create a hue/saturation adjustment layer. Kick the saturation up to +20.
>>
Create a new layer and stamp what you've done so far on this new layer by pressing Ctrl+Alt+Shift+E. Duplicate this layer and set the duplicate to soft light. You're done!
>>
Note: Depending on the icon, sometimes I blur the last softlight layer with a gaussian blur at 1.1 radius. It depends on the icon. This icon, with the blur, would look like this: