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You can install unity-extra/diodon clipboard manager for the Unity7:
unity-indicators/unity-indicators-meta paste -
You can install mail notification with Messaging menu support net-mail/mailnag:
unity-indicators/unity-indicators-meta mail -
You can enable Java global menu support dev-java/jayatana if you are using some Java applications:
unity-indicators/unity-indicators-meta java -
You can try Ubuntu Unity theme as the default one if you don't like Ambiance:
unity-base/unity-settings ubuntu-unity -
You can try Dash classic look - horizontal with bottom scope bar:
unity-base/unity classic -
You can try classic fonts media-fonts/ubuntu-font-family instead of newer media-fonts/fonts-ubuntu:
unity-base/unity-settings ubuntu-classic -
You can try to turn on system tray support for all applications if you are missing some icons:
unity-base/unity systray