I think that gamertags are much better when they're more to do with
you. For example, my name is
Connor Luke Jones, and my gamertag is
vCLJ.
Things like, xXsnIpErGoDXx are pathetic and childish; why not make your gamertag more special to you, and personalise it to you.
Mix your name with some slang, add some decoration, like x's and v's etc. mix in some other words.
Think about zzirGrizz and OperatorPerry, their names are mixed in with their gamertags, and now their some of the most famous names on xbox live.