I did a couple of masks (and now I'm thinking of a third for my young hotshot goalie who'll probably have a terribly brief but eventful career due to his terrible CL progression).
One, I made just a generic mask that represented my team name. Found some art on google image search, made it work.
The other, I picked something in the goalie's name, and nicknamed him off that - the nickname became the theme for his mask.
For my new one, since I'm a goalie myself I know how personal the masks can be - so I'm going to invent some sort of backstory/personal profile for the goalie, and find some themed images online - like "He's a big motorcycle buff and bought 10 new bikes with his first signing bonus" so his mask will likely have some sort of motorcycle theme.
JSF Lightning is your new team name? I can think of a few themes I might try on that, but I wouldn't be able to try till this weekend maybe, so canucks357 might get to it first.