How to change bubbles screensaver to another pic?

I like the idea of the bubbles, but instead of having bubbles on the actual screensaver, I'd like to know how to change the bubbles to somethings else for example rocks, another logo, etc. Can I get some assistance???How to change bubbles screensaver to another pic?
I don't think there are ways to do it without any third-party software. However, you can change the bubbles to something like billiard balls by going to the registry:

1.open the registry editor by pressing win+r and typing 'regedit' in the box and press ok.

2. In the pane on the left, go to HKEY_CURRENT_USER\Software\Microsoft\Win?

3.Create a new DWORD value by right-clicking on the empty space at the right. Name it 'Materialglass' and set its value to 0.

It should work right now. If you want to change the bubbles to something else, I think you will have to use third-party screensavers program.