I recently put out a password manager that follows the new material design guidelines. It only works on L and is only available as a beta so join the g+ group below. If you have a device that can't run L you can help test the 4.0+ version available in the community.
Some info about the app:
It encrypts all of your passwords using your "master password" as the encryption key, and stores it securely in your device storage. You don't need to worry about cloud storage or anyone else seeing your passwords.
Anyway go join the beta and report here or in the community any bugs you come across (:
Also have some screenshots
Side note: does anyone know how I can make the community public so I don't have to accept everyone that wants to join?