Hi Anthony,
Thank you for posting your query in Microsoft Community.
I understand that you want to use the Windows Media Player visualizations to customize your own videos. However, you might only be able to use that are permitted for commercial purposes.
So, I would suggest you to refer to the following link to download various visualizations available for Windows Media Player.
Visualizations for Windows Media Player
However, I would recommend you to go through the Microsoft License agreement when you download or install any visualization package published by Microsoft. You might need to seek permission before you use it for commercial purposes.
Alternatively, you may also use your favorite search engine to look for various other third party resources that provide visualizations for free.
Disclaimer: Using Third Party Software, including hardware drivers can cause serious problems that may prevent your computer from booting properly. Microsoft cannot guarantee that any problems resulting from the use of Third Party Software can be solved. Using Third Party Software is at your own risk.
Hope this information is helpful. Do let us know if you need