In my early days of blogging I created a gratitude list in my side-bar which I have added to nearly every post. Most of the things I am grateful for are constants - family & friends, the pets I have the pleasure of caring for (even Phoebe the difficult cat!), things like the roof over my head, my spectacles (even though I dislike the frames I have chosen!) morning walks, the opportunity to paint and then all the many, many little things. Practicing gratitude is like doing a stocktake of your life, discovering just how much you actually have.
The science tells us that we are happier when we practice gratitude and I would extend that to telling others how grateful we are for the things they have done for us. Not just a quick 'thanks', but really getting the message across that they have made a difference to your life. Take a look at Christine Kane's blog post on being present in a state of gratitude.