You should try the seed longliveherobrine it's a snowy/grassland/desert area where HeroBrine is supposed to be sighted the most . If done right you should spawn near a lake in a desert area net to ice covered water. HeroBrine is Notch's dead brother for those who don't know and he has the regular Steve skin with white eyes that was created in version 0.0.0.0.0.0.0.1 I think in memory of him. Most people just call him "HIM" to save time than saying HeroBrine. He used to just watch people but now in version 1.2 he's sick of it and he attacks you. Notch thought he removed "HIM" in v 1.5.6 I think.