In Fallback Gnome with Ubuntu 11.10, the Ambiance theme makes the panel look weird. It has different color grays in different places.
I will show you how to make the panel look the the panel in Unity and/or Ubuntu 11.04.
1. Press the Alt key, right click on the panel, and go to properties.
2. Under the background tab, select Background image and browse for an image.
3. Go to File System /usr/share/themes/Ambiance/gtk-2.0/apps/img and open the panel.png image.
It’s that simple.
Repeat the steps for the bottom panel.
To get the indicator applets seen in the screenshot above, check out my post here.