There is no such thing, so far as I can see, but there is one way to get a somewhat more classic design of Ubuntu that will allow you to use one. Log out of your account. Click or enter your username (depending on whether you have hidden the user list or not) and then look at the bottom of the screen. There are 3 menus, and one of them probably says something like "Ubuntu" or "Ubuntu Desktop". Open this menu, and then click "Ubuntu Desktop Classic". (This may not be exactly what it says, but it's close) Now enter your password and log in. You will see a somewhat familiar Ubuntu desktop. ONE DIFFERENCE YOU DO NOT WANT TO MISS: The menus are integrated into the top panel like in Unity, but the title bar does not merge. Don't try and put the old tri-menu start button replacement in, because you will have menus from your open apps mixed in with them. (Example: Applications Places SystemFile Edit View Tools)
Once you have that, just use Ubuntu and the Gnome Panel like you would in 10.10. All of the options to add applets are still there.
Hope that is what you are looking for.