Non-realistic weapon replicas made of soft materials:
Foam, thermoformable plastic, vinyl, latex, papier-mâché, LEDs, silicone, hot glue, PVC, resin, balsa wood, Forex, leather, rubber, expanding foam, Worbla, plaster, polystyrene
Nerf guns without ammunition
Reusable canteens and bottles (not made of glass)
Fantastic cosplays