In the excellent post, 100 Great Tips to Improve Your Life by Leo Babauta of Zen Habits, Leo compiled a list of principles, each with a link to an article. Improve your life in almost any way and it will improve your mood.
These were some of my favorites:
The Power of Ten Minutes. Ten minutes has gotten a bad rap. You can get an amazing amount of work done in a short spurt, and thinking about doing something for only ten minutes isn't daunting in the slightest, which encourages you dig in.
What Google Can Teach Us About Self-Image. The Google focused on what they did well and made their search engine as great as possible. Their success gave them confidence to branch out. But they do not rush into new things. They take their time and do things well.
Photographing Your Mementos. Save on space and lower clutter. A trophy, a teddy bear, and that gift from Aunt Mildred are great mementos but they all take up space. Digital photographs of those things can serve as mementos but don't take up any space.
Increase Personal Productivity with the Top 11 Multiple Positives. A multiple positive is something that benefits you in multiple ways, like biking to work (you're getting to work and exercising) or listening to audiobooks in the car (you're going where you need to go and reading a book you want to read). "The more multiple positives you use, the easier it is to get everything you want done without feeling stressed. They also free up loads of time and create a pleasant feeling of satisfaction and efficiency."
A Primer on Getting Things Done. David Allen's book, Getting Things Done: The Art of Stress-Free Productivity, is full of fundamental insights on staying organized while staying flexible. This article shares the meat of Allen's work.
Stick to a Regular Schedule of Exercise. The list of benefits you get from exercise is enormous. The hard part is doing it regularly. Gretchen Rubin, author of The Happiness Project, shares 14 hot tips on how to make exercise a regular part of your life. Excellent.
How NOT to Multitask – Work Simpler and Saner. Multitasking is more complicated and less efficient than doing one thing at a time. This article has some great principles and tips on how to prevent yourself from falling into the trap of multitasking.
Getting Things Done Cheatsheet. This is kind of a CliffNotes for Getting Things Done. It's a great overview of the process.
Eliminate All But the Absolute Essential Tasks. If you find that your workload just keeps increasing, and you find yourself squeezed for time you don't have, this is a good checklist for how to reduce and eliminate what isn't vitally important.
Use some of these great ideas to improve your life and improve your mood. Don't overwhelm yourself: Just choose one that seems promising, and put it into action. You can always come back to the list later and find another one.