SetSystemVisualStyle

[DllImport("uxtheme.dll", SetLastError = true)]
public static extern void SetSystemVisualStyle(
   [MarshalAs(UnmanagedType.LPWStr)] string pszFilename,
   [MarshalAs(UnmanagedType.LPWStr)] string pszColor,
   [MarshalAs(UnmanagedType.LPWStr)] string pszSize
);