I am a bit of an avatar junkie. There are so many possibilities in Second Life.
This is my standard avatar that I use for teaching and presentations:
Her clothes and hair sometimes change but the skin, shape, and eye color remain the same.
Sometimes I break out the ghost avie:
My colleagues and I have noticed a strange phenomenon with avatars that are not clearly anthropomorphic. Sometimes these less-than-human shaped avatars begin to be ignored during a conversation. It is like the avatar becomes part of the furniture rather than representing a user.
I just starting playing WoW for this course and after testing a night elf on the Alliance side, I wound up creating a troll on the Horde side. (I also received some teasing from a serious WoW player for choosing the Alliance.)
Dianthaa is a Warlock and is still going through training. The clothing in the image is that of an acolyte. She has since been girthed in leather which offers much more protection. Dianthaa sometimes gets her spells mixed up and still can't figure out how to use her staff, but is persevering. She has an interesting little minion that assists her.