PSO-World has added 30+ avatars to the new Phantasy Star Online 2 category. To see preview pictures of the new avatars, check out this forum thread. You can use these new forum avatars by going to your User CP and clicking on "Edit Avatar."
Wow, if this question was asked 10 years ago, I'd have a definite answer right away. But as of now, my best advice is to check the ID section for guides