Family tree wall: Self-stick tree decals are available in many designs online. Scan old photos (It's quick 'n easy with iPhone or iPad + Pic Scanner app); print and frame. Download the app free at the App Store.
Monochrome chic. Simple is best in a narrow hallway. White painted stairs make them appear wider and the grey runner is both practical and elegant. Seek out a slim console - vintage or modern - thats useful and decorative but not space-consuming.