The avatar is fully modifiable (except the scripting, of course). You may adjust the appearance as desired through the normal appearance mode. Alternately, if you have a favourite modifiable shape, instructions are provided on how to alter the lower half so it can be used with the centaur avatar. And of course, any clothes, skins or hair that a human can wear can be worn by the centaur.
For the gentlemen, a centaur stallion may be found at
http://www.slexchange.com/modules.php?name=Marketplace&file=item&ItemID=223554
For the ladies, a centaur mare may be found at
http://www.slexchange.com/modules.php?name=Marketplace&file=item&ItemID=223552
Or you can drop by our shop in Port Caledon
http://slurl.com/secondlife/Port%20Caledon/92/129/22/
Or Caledon Tanglewood
(SLURL forthcoming--the shop is next to the telehub, the avatars are in the Steampunk Mushroom

Four leggedly yours,
Miss Virrginia Tombola
Owner, La Bicyclette