When it comes to my cell phone, I'm a face plate nut!  I like to change them frequently.

However, just recently I purchased two from the same seller that were covered with metallic glitter.  Nice and sparkly!  They look great!

But, they also block the signal.  Consequently your cell or other wireless device won't really work.  If the phone is on, it keeps seeking a better signal.  In doing so, it uses up all of it's battery strength.  Not to mention really poor reception.

Stick with the leather/plastic or colorful designs.  You'll actually be able to use your cell phone, in addition to saving money.