Fully custom lock screen, pattern draw for unlock, customize your message app, tiny notification bar, when you plug in headphones a menu will pop up asking what app you’d like to launch.
OH and my favorite tweak. Sign into multiple accounts on apps. When I click on tumblr it will ask what login is like to use and I never have to sign into the other one when I decide to switch logins.
I even have a finger print scanner for certain apps to lock personal information.
So much to do with a jailbreak :)