Here is one of my attempts at a memorable passphrase generator, using Moby Dick as source material. It is interesting to see just how distinctive some works and authors are when you are doing this sort of thing:

https://github.com/exratione/four-word-phrase

clenched bakers detestable evincing

keenly eastern expertness presto

topsails existence self-created fittings

delusion brushed lockers discipline

seaman vintages cross-bones uncouth

furnished vanity copied invited

sea-captains cross-running engendered disastrous

freshet willingly lead-lined asserted

remarking repentance insert compendious

vice-bench equally imminent quadrupeds