padlock or colored url bar for connections to hidden services
When connected to https protected websites, there is a nice looking padlock, sometimes if the website bought a Extended Validation Certificate, there is even a nice looking green bar.
Most people are not aware, that connections to hidden services are encrypted end-to-end  by default, thanks to Tor. This is a nice security feature and argument for Tor, which has very little public awareness.
Why not have a padlock or colored (black?) url bar for connections to hidden services?
This would also be a good way to teach people, that when they are using services like tor2web or onion.to, that those connections aren't encrypted end-to-end, while connections to hidden services using Tor Browser are.
Credit: This is an original idea of mine. It has been discussed on reddit.
,,  To be pedantic, connections to hidden services are only encrypted end-to-end Tor to Tor, not exactly client (browser) to server.