The first picture is probably the easiest style to pull off with a full cap. With the right density it will look like a perfectly natural head of hair.

The cornrows I'm not too sure about. In theory I'm sure it could be done, but you would have to have a flawless attachment and I would worry that the bond might tend to pull away from your skin. Plus it might cause the unit to shed prematurely.

I would love to see someone do it though.....