I'm so sorry for your loss. I lost a cat before that I loved dearly. I had her for my whole life. Making a collage would be good. I made a "shrine" thing to one of my dogs that died and my cat. I can see them everyday. Also, if your cat was an indoor cat, don't leave your shoes laying out. I used to and whenever I saw the shoes in the corner of my eye, I thought I saw my cat. Of course it was just a pair of shoes and it was upsetting for me.