Due to the lack of any preview option on the pricey armour shaders, the link below is a collection of screens from various shaders so you can get an idea of what it's going to turn out like before dropping the glimmer.
http://www.reddit.com/r/DestinyTheGame/comments/2g3ydx/since_shaders_are_kinda_of_pricey_and_theres_no/