Notification inside admin page

[Karl_T]

I am looking for a way to implement the alert/notice list look like the below image.

SystemNotifications seems like the closest one, but I cannot find any way to modify it. Also, I think it is a more neat way to present them using individual page for each type of notification instead of display them all like the existing SystemNotifications. I can imagine a template called Notifications under admin. Under Notifications, we can add page using NotificationType template which can control the color.  Then we can use something like

$user->notifications->type->add("Message to send"); 

to add notification to a user when some events happen.