My number one tip for this is to schedule it in and stick to your routine. If you just have a vague idea that at some point you will get something done, it probably won't get done anytime soon. By making an appointment with yourself, and writing it down in your calendar, appointment book, or entering it into your phone or scheduling system, you are more likely to stick to it and actually accomplish it.
It is so important to take time to think about the things that we have to be grateful for as part of giving thanks to the universe. Feeling and expressing gratitude has health benefits both physical and psychological, not to mention spiritual.