I took a photo of myself on my iPhone and superimposed various cyborg features onto it. It was only meant to be a quick n' nasty thing, but had the resources available I'd have loved to have done a proper photoshoot with hair & makeup and proper lighting to get much better results.
This would do at least for a proof of principle. It wouldn't be very difficult to replace the face part with a better photo.
The facial hair and head hair here is all fake (it was actually a blonde/ginger head of hair I had to re-colour!). A very fun project.