If you are just using Twitter to chat with friends, then it doesn’t really matter what you put on your profile. But, if you are using it for your company or to build your reputation, it can pay off to put a little bit of effort into changing the default avatar and spicing up your profile page.
Socialdesire has a video with tips on this here.
And just for fun, if you want ideas for unusual and funny ideas for facebook status updates, try
generatus.com. As the name suggests, it is an status generator. If you use it before everyone else discovers it, then people might think you are original and clever. Time is running out.