You may get further inspiration when thinking about different themes/settings (locations, ages) in adventure games: things needed in a sci-fi game (different keycards, radio devices, sci-fi tools, laser weapons, parts of all of that to be combined in the game, a pet alien
), a medieval/fantasy game (sword, pitchfork, goblet, gems, magical rings, ...), a game with pirates/islands, a steampunk world, in the desert, in a hospital, in an office, in the average household, in Stone Age...
