I'm thinking about changing my display on my Hulk Avengers pin and would love to hear some recommendations from others on using an Xpin display or something similar as my green display seems washed out or lighter than the rest of my Sterns. How hard are they to install and with these colored gels are they reusable or once you peel them off and put them on are they pretty much used up? The blue on the Tron looks really cool.