This speaker cover for the 3D Printing Nerd's contest.

The cover has the same concept as the Fiber Optic LED lamp. Instead of using a Fiber optic cable. Filament size to be used is 1.75mm transparent filament. I would recommend to use ABS, PETG, or any more flexible filament (first link). 

Be espire'd and use this design to make your own speaker cover. 

Inspired by:
https://www.instructables.com/Fiber-Optic-LED-Lamp/
https://www.reddit.com/r/3Dprinting/comments/fo4xja/transparent_petg_acts_like_an_optical_fiber/
https://www.youtube.com/watch?v=DnIO2o9Vwwg

Warning: I have not printed myself yet, so this hopefully would work in theory

#3DPNSpeakerCover Customizable Fiber Optic LED Speaker Cover

This is where you would arrange arrange the filament around to your liking . 

Speaker Front.stl

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#3DPNSpeakerCover Customizable Fiber Optic LED Speaker Cover