I find goalie masks to be absolutely fascinating--and could even be considered quite beautiful in some cases. I guess my fascination began way back when Gerry Cheevers was the goalie for the Boston Bruins. His mask looked like this:
Cheevers was the first goalie to decorate his mask. After he took a shot to his face during practice, the trainer painted stitches on the mask where he would have gotten cut if he hadn't been wearing a mask. After that, stitches were added after every face shot. And that was the beginning.
I believe every goalie in the NHL--as well as college, etc--has a painted mask these days. That is, except for Chris Osgood from Detroit. He now stands out because of the lack of artwork--which he prefers. Not much to look at, but unique.
Most goalie masks have some meaning for the wearer. Some are deeply personal and most have a connection to the team he plays for. ALL are very interesting, colorful, and, no doubt, horrendously expensive!
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As I said, there are reasons for what is painted on a goalie's mask and here you can find the stories behind some. (Click on the picture to zoom in and read the captioning.) A very interesting read.
And for the person who wants even MORE to look at, here is a listing of past masks. Again, some are just amazing.