Yes the Empire didn't die with Palpatine.
Conflicts between different Imperial Factions and
those factions and the New Republic have been the main theme of all stories situated after the movies.
Even during the new jedi order era, when new villans come into play (the extra-galactic Yuuzhan Vong), the Imperial Remnants are still an important force in the galaxy.
Do you want
more star-destroyer-like ships?