Oh yeah, I made that one a while back Well, blurring and tweaking the lighting really were key points with that signature. The ''disintegrating'' effect comes from first smudging the focal to the background, then adding a bunch of clipping masks and in the end using a special effect on GIMP called ''displace'' located in the ''map'' effects.
So here I am searching "game of thrones sig" on google and I find this amazing signature,. I click the link and it takes me to the deviantart of our friendly neighbourhood Spryde!
I would really like to know how you get that dept of field and the whole 'disintegrating' effect.
My theory is that for DOF you can use blur and then erase parts of it and for the effect, its just some smudge