With now 8 chapters released that came after vol. 45 I think there´s enough of them to make out the essence of the volume (though at least there´s still two more chaps to go to make a complete tanko). That said feel free to discuss and speculate all the stuff that belongs in volume prediction thread.
My guess for the volume´s title is (if nothing groundbraking comes up in the next two chapters) "Adventure in the Evil Sea".
As far as the cover is concerned. I´d say Brook, the three Strawhats in the mansion and Luffy riding Cerberus would make for a cool cover. The Thriller Bark mansion with Graveyard in front would make for a good background.
Color? Something not so bright and shiny would fit the theme actually but then again, predicting that always goes wrong. :getlost: