if you add all of the avatar choices up, you get.
27 Faces
28 Decals
2 Body Shapes
7 Headwear
4 Headwear Accesories
6 Back Accesories
6 Shoulder Accesories
2 Shoulder
2 Shoulder
2 Hand
2 HAnd
1 Pants
2 Legs
multiply each number by eachother and you get something over 400,000.
and that doesn't even include the 100,000,000,000 possible RGB color combinations.