The store hasn't been giving out many themes lately. Years ago, they used to give out at least 1 a week.
Complete list of freebies given out on September 2. Sorry for not posting them Tuesday night.
PS3 free-to-play game Deathmatch Village
Vita free-to-play game Deathmatch Village
Both versions support cross-play and cross-save, but they are not cross-buy bundles, so you will have to claim the 2 versions if you want both.
Akiba's Trip: Undead & Undressed PS3 version:
Akiba's Trip: Undead & Undressed Vita version:
Dead or Alive 5 Ultimate:
PlayStation Vita Pets:
Sword Art Online: Hollow Fragment: