I'm not talking about favourites.. I'm talking about the ones that made you go "Oh snap, that's freaky".
Mine would have to be I Want You (She's So Heavy). While not technically a dreamscape, I really liked the way the 'camera' went white and fuzzy, and just cut to black at the end. I played it on vocals, and spent all my time just staring at it.
That or Within You Without You, when the wall explodes behind Ringo.