One of the most eerily fascinating Titanic ghost stories I've yet encountered is that of 3rd class victim, Daniel Coxon. Coxon was the night watchman for the well-known Scott Mansion in Merrill, Wisconsin. However, he was perhaps better known as "Popcorn Dan", the jovial owner of a popcorn vendor in downtown Merrill.
Coxon died in the disaster aged 59, and according to local legend, the ghost of bearded "Popcorn Dan", who suffered from a badly injured arm, still regularly haunts Scott Mansion, which is now thought to be cursed.
Most likely the stuff on fantasy, but it's still worth making a note of who sells you popcorn if ever you're in the Merrill region!
Titanic passenger Dr. Washington Dodge's ghost has purportedly been spotted in the basement of 840 Powell Street, San Francisco, where he shot himself on June 23, 1919. See the article "Iceberg At The Golden Gate," under Titanica Research.
FWIW, George Behe has noted a number of claims of paranormal events assocciated with the Titanic. You can read about some of them HERE. While I can't vouchsafe the veracity of the stories, they are out there.