Hello Trenton,
You could modify the
DefautIcon key under each registry key below for these folders.
(Music)
HKEY_CLASSES_ROOT\CLSID\{1CF1260C-4DD0-4ebb-811F-33C572699FDE}
(Downloads)
HKEY_CLASSES_ROOT\CLSID\{374DE290-123F-4565-9164-39C4925E467B}
(Pictures)
HKEY_CLASSES_ROOT\CLSID\{3ADD1653-EB32-4cb0-BBD7-DFA0ABB5ACCA}
(Videos)
HKEY_CLASSES_ROOT\CLSID\{A0953C92-50DC-43bf-BE83-3742FED03C9C}
(Documents)
HKEY_CLASSES_ROOT\CLSID\{A8CDFF1C-4878-43be-B5FD-F8091C1C60D0}
(Desktop)
HKEY_CLASSES_ROOT\CLSID\{B4BFCC3A-DB2C-424C-B029-7FE99A87C641
Hope this helps,
Shawn