The original image itself was this:
I am still VERY new to photo manipulation, so someone with a deeper understanding of Photoshop will most likely be able to come up with something better. My image was done purely by using liquify techniques, and adjusting the hue/saturation of multiple layers.
This is by no means done disrespectfully towards the late Heath Ledger, I am sure he will do an excellent job of being The Joker in the new Batman movie. I just thought I would try this partly as an experiment (I will go on to photoshopping myself next) and as I had Jim Carrey in mind (favourably) before the role of The Joker was publicly announced for The Dark Knight.