Daily Inspiration In Passwords
I have been running a little personal experiment that seems to be working. Instead of using some random whack password like 4tUg9giB I use something like Dr1nkL3ssDP. That password would remind me on a daily, and sometimes hourly, basis that I should drink less Dr. Pepper. It meets the criteria of being strong, it is meaningful which means it is easy to remember, and the best part is that it is a reminder of an improvement that you are trying to make at the time.
Also, since you should change your passwords often, you can change your password to help you with your next improvement.
*Note* All passwords used in this post have never been used by me, which should be obvious since I still drink Dr. Pepper like never before.