Just mess around with it... I like windmilling on the arm for a bit of show-boating.

Check out http://www.guitarshredshow.com - link was posted in the 'places to visit' section, but picked up a few ideas from the lesson section on the site... and it's a laugh too!

I find over use of the bar is like over use of anything else... do the same trick twice, and people are like.... yeah.... whatever....