When we take time to appreciate the positives, it focuses our mind and makes us more mindful and aware. It is very easy to take things for granted. Practice thinking of a few things you are grateful for each day. Gratitude journaling is another tool to raise our awareness and shift our thinking to the positive.
Gratitude is a quality similar to electricity: it must be produced and discharged and used up in order to exist at all. ~William Faulkner
For more ideas, check out the Six Habits of Highly Grateful People.