I made dead prom goers, so I did pants on one and a dress on the other. Stuff pantyhose with old plastic bags and newspaper, then glue this to the torso. Attach feet and hands with hot glue. Dress your lil' sweetie up in his or her new duds. Don't forget those special extras like jewelry, makeup, moustaches, sideburns, etc, etc.
Drape corpses with spider webs when displaying, for that extra-moldering look.
Glue a few bugs to the mouths, as well. Note the stylish tiara that our heroine sports, as well as a devilish bouquet of black flowers. The gentleman is becoming in his Salvation Army black suit and Jim Morrison-esque coif.