Either for yourself or for others you can have small pillows made from your spouses t-shirts, scarves or other clothing. Different sized pillows for covering can be found at any fabric store, if you are able to do the sewing yourself. I treasure one made from a t-shirt that is always there for hugging.
Buy yourself a gift from your spouse. What might you have asked for if he/she were here? Imagine his or her pleasure in your having it.
Buy a gift for your spouse. A painting he/she would like, a nick knack that represents something of his or her personality or interests, a ring to wear representing ongoing love, a CD you would both like or something you both had been considering buying for your home.