The San Diego Reader has been running a series of features highlighting unused poster artwork. Their most recent release includes poster art from Return of the Living Dead:

[Tombstone Art] "Original painted art for the Return of the Living Dead tombstone, before the comical zombies were added... Note the spraycan-bearing skeleton hand was originally the only part of the zombie arising from the grave."

[3D Poster] "Note below horizontal variant is dated a full two years before Return of the Living Dead was actually released. And it was originally planned for 3D?! As far as I know, this is a hitherto unknown component in the film's early development"