Doom and DoomII's monster models were actually latex and clay models that were scanned 8 different ways and just cleaned up, rather than being made by people sitting down and drawing pixels.
In related news, who knew Romero had a super cute wife.
http://romero.smugmug.com/popular/1/...12524880_momuY
And who is this interweb celebrity in his collection of photos!
http://romero.smugmug.com/popular/1/...#5413260_nmEaZ