Because of the new minecraft 1.8 armor stands people are making insane body displays! Wanna learn how too? Well here you go!

Here's the base command:
/summon ArmorStand ~ ~ ~ {ShowArms:1,NoBasePlate:0,Small:0,Invisible:0,NoGravity:0,Pose:{RightArm:[0f,0f,0f],LeftArm:[0f,0f,0f],RightLeg:[0f,0f,0f],LeftLeg:[0f,0f,0f],Head:[0f,0f,0f],Body:[0f,0f,0f]},equipment:{[id:0,id:0,id:0,id:0,id:0}

Explaination:
Tags:
ShowArms: will toggle if the stand has arms or not, arms han hold items.
NoBasePlate: will toggle the stone slab under the stand.
Small: will toggle if the stand is smaller than normal.
Invisible: will toggle if you can see the stand (Not including armor/items)
NoGravity: will toggle the falling of the stand.

Pose:
You can modify every part of the stand; RightArm LeftArm, RightLeg, the Head, and the Body.
The first 0 in each list is the vertical rotation.
The second 0 is the rotation of the part.
The third 0 is the horizontal rotation.