Remember, good or bad, this moment is only right now, not the rest of your life.
Set a goal in the morning to increase your awareness of the enjoyable parts of life. Make it goal to smile at 10 people you don't know, or smell 5 new flowers, or find the top 5 moments of your day.
Ask yourself if you can do anything about what you're worrying about right now. If not, stop wasting time worrying about it.
Walk away from gossip. Negative people only make you feel worse than you need to, and gossip is one of the best ways to spread negativity.
Create a mantra to repeat when negative thoughts threaten to take over.
Force the right thoughts into existence. If you think it enough, you'll bring it to life. Unfortunately, it's much easier to focus on the negative things, thus giving them life. What you assume will happen is usually what happens.
I'm actually in a pretty poor mood today. My feelings are hurt and that's what's on my mind. So I have run out of tips. What do you do to live in the moment or embrace the positives?