I am searching for recommendations for a thin malleable plastic which can be easily formed at room temperature. Does not need to be strong. Really appreciate your recommendations of what to look into.

Edit:
Thank you for the replies. What I am imagining is a plastic that is a square that could be ran under warm/hot water while in a plastic wrapping and then easily molded. Even more ideal would be something that is moldable without having to be heated.
Again, thank you for the suggestions.