After I stopped lucid dreaming for 6 months and decided to come back, I had my first real success, using the most feared reality check... MIRRORS! There are countless warnings all over the internet about looking into a mirror in your dreams, but I think that the only reason anyone ever sees a scary version of themselves is because they fear they will. I know I did at first, but after you get over the fear, your reflection is nothing to worry about and is effective at making you lucid.
If you have read Stephen La.Berge's book "Exploring the world of lucid dreaming", you would know what I mean. The bottom line is: Don't fear mirrors, because that fear is stopping you from lucid dreaming. Good luck !