If you have a digital camera, carry it with you for an entire day and keep a lookout for things that you think are creative or interesting. Take a picture of these things. Go for at least 100 photos. If you are having a hard time, try to focus on the little details. A book could have a creative title or a pile of paper clips could be in an interesting arrangement. At the end of the day, review the photos and pick your favorite 5 things. What makes these things interesting to you? By doing this exercise you will be increasing your awareness of the creative aspects of things that are all around you. The photographs are also a good source of inspiration that you can turn to when you are stuck on a problem. Sometimes seeing other creative solutions will help you discover your own.