Body prayers

There are some good resources on Jonny Baker's blog here: http://www.freshworship.org/node/295

Just scroll down and there's a really good piece about 'prostration' by Steve Collins that begins:

kneel down on the floor
bend forward until your forehead touches the floor
stretch out and lie face down

this is the posture of complete submission
abasement
desperation
self-negation
abandonment of self to another
anguish
a pouring out of the inner self upon the ground as an offering
at the feet of god, or another person