“It’s actually pretty simple, most of these images are ~5 min jobs. The process is mostly just: 1) Copy the head onto a new layer. 2) Reduce background to 65% size (that’s the value I was using anyway) 3) Puppet warp the base of the neck/hair to get it to match with the shrunk background as much as possible. 4) Mask away (with a soft brush) the edges of the head layer to make it consistent with the shrunk background.”
An award-winning experimental short by Samuel Blain (his graduation piece from Northumbria University) in which four subjects talking about their vivid dreams have their heads replaced with appropriately nightmarish visual manifestations.