On the first one I cut the tip of the head off and then cut a partial triangular pattern.
On the zig zag, it is a little tricky and does take time. Definately not a production process but fun to play with. You have to cut a small strip off the top to allow the plastic to flow ovr it. Then you cut your pieces out where you want the other color at. You have to make sure you cut a small piece of the nose off to allow the plastic to come back into the cavity

