If you like playing with screensavers a message like this can be discouraging:

However you can still take some control over this screen saver with your trusty registry editor or reg command line tool.

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Screensavers\Ribbons

NumRibbons lets you set the number of ribbons. RibbonWidth? Yes, this one lets you set the width of the ribbons. However, you won't find these registry entries present by default. You'll need to create them as DWORD types and the values they take are hexadecimal.

Set the number of ribbons to 100 and see your screen transformed into a writhing pile of colorful worms:

reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Screensavers\Ribbons" /v NumRibbons /d 100 /t REG_DWORD

Set the width of the ribbons to a decimal value of 1008981770 and they all get much thinner (better for those larger numbers of ribbons).

reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Screensavers\Ribbons" /v RibbonWidth /d 1008981770 /t REG_DWORD