Putting posters on my wall?

[Charollette]

I want to fill a whole wall full of my posters I have in my closet. In my closet (it has no doors), I am allowed to use push pins. ONLY in my closet.

What can I use to put them up on the out walls with ruining my walls OR the poster. And nothing that will fall off easily.

Thanks in advance

[justinemily]

Use Wooden Frames not from the shops but create at home from the old wooden furniture that are not in use due to damage.