I'm surprised nobody has bothered to post this one here yet.
Even I had trouble deciding where this should go.
Basically it's one of those generators where you can fiddle around with character sizes, hair color, breast size, facial expression and so on.
http://pochi.x.fc2.com/k_kisekae2.html
It should be quite easy to figure out despite it's japanese origin.
Throwing in some interesting sequences people have made with it so far.