Use the patched NotifyOSD to customize the notification bubble for Ubuntu 13.04
You may prefer the standard bubble notification than the new toast notification in Windows 8. Here is how you can disable toast notifications in Windows 8.
In Windows, there is no centralized place to configure the notification system. Snarl is a free Windows Notifications replacement which can handle all the notifications and also features a centralized configuration. The best thing about Snarl is that it will not steal the focus of the window when showing a notification.