If you are using Parallels on OS X and want the smoothest looking interface possible, you may want to consider installing WindowBlinds in your Windows installation. As you can see in the image above, using a WindowBlinds skin on Windows, you can make the applications look almost exactly like standard OS X apps. That means that when you enable coherence mode, you are going to feel like all of your running applications are a native part of OS X. Not bad at all. Hit the link for a higher resolution image.