Of course, your reminders don't have to be limited to the physical world. Since you're spending a chunk of your life online, use your account passwords to reinforce your new habits.
In her bestselling book The Happiness Project, author Gretchen Rubin explores a million different ways to become happier. In a chapter on meditation and mindfulness, she includes a quote from a blog reader on their strategy to stay mindful:
I changed my passwords to a goal I've been working on, or an achievement I want. They become a constant reminder of my goals, my dreams, or what I want to achieve. It's basically the same idea as repeating positive thoughts in your mind.
Think about how many times each day you type passwords into computers and accounts. Then, think about what your different passwords are actually saying. Are they mundane? Negative? Would you be happy to repeat your computer passwords to yourself in the mirror every morning?
If the answer is no, it's time to change your password to something more inspirational. Use your New Year's Resolution or another goal to create a password that inspires you to feel good and make good choices, while sticking to good password security guidelines of course.