I’m sure there are hentai shower curtains

A shower curtain of After Dark Flying Toasters

Get a picture of yourself taking a shower. Print that onto the shower curtain.

This is our shower curtain.

One that is way too short

The full text of the communist manifesto in fine print on the inside and this on the outside:

1. Take a normal shower curtain and have at it with a long kitchen knife. The knife cuts won’t let very much water through so it will still be effective as a shower curtain.
2. Take a stray can of red paint and spray be a few two or three long strokes across it.
3. Only attach the rings of one end to the shower rail up to one half at most. Break the remaining rings and leave them on the bathroom floor.

Velvet.

The one with you naked since it defies half of the purpose.

A transparent one

A photo of yourself, naked, in that very shower. With your dick enlarged to a comical size. (Or shrunk.) (Yes this is a gender neutral suggestion.)