I am not necessarily advocating you go and host parties for every little thing you can think of, but have little celebrations for little things. Life is short and passes by so quickly. Celebrate that great sleep you had last night with your favorite flavored latte. Celebrate that ten pounds you just lost with a relaxing home spa night (Scented bubble bath, face mask, painted nails, mmmmm).
Try to notice the little things that usually pass us by. Forgetting to ask for ketchup at Wendy's, but they put some in the bag. You barely had to wait at the bus stop because it got there at the same time you did. It's a sunny day not a cloudy one. Heated seats in your car in the winter. The person walking in front of you held the door for you, maybe return the favor for someone else later.
There are so many wonderful little things for us to pay attention to instead of crappy traffic, how crazy this week was at work or school, or how that picture on the wall is crooked. Look for the good instead of the bad.