The decorator William Eubanks has created sumptuous, sophisticated interiors for well-heeled clients internationally, but the city of Memphis, Tennessee, will always have an ancestral claim on him. After all, he was born and raised there and has never entirely pulled up stakes. His work has landed him for spells in New York and elsewhere, but his workrooms remain in Memphis, not to mention his harlequin Great Dane puppy, a dead giveaway that his heart won’t relocate.