diy sound diffusers made with plastic water bottles, would it work?

[Rod Norman]

Here's a guide to making a good diffuser. I use 2x2 inch wood. The numbers in the diagram refer to the length of the piece in inches.

 

[Supercreep]

In a small room, diffusers aren't going to do anything useful except look cool.

 

[mjbphotos]

In a small room, diffusers aren't going to do anything useful except look cool.

And collect dust - they look like a PITA to keep clean.