The tools to make   panoramic eggs  are two- piece hard plastic eggs.  This is a set of three different sizes.  I've used the middle size in this article.  Also available are soft plastic two-piece molds.
I prefer the hard molds. HOWEVER - THEY'VE BEEN DISCONTINUED :(

You can find two different sizes of the plastic molds on my site under Easter Molds
(under molds on the left hand side of the home page)

The eggs are made of granulated sugar mixed with just enough water to create a mixture like damp beach sand.  Sprinkle the water on the sugar and mix it with your hands until it will hold together in a clump when you squeeze some with one hand.  You will soon figure out just how damp you want this.  Too wet and it will stick to the molds and take too long to dry.  Too dry and it will not hold together when you "unmold" it.  

First step is to fill one half of the egg and press it very firmly to eliminate any air pockets.  Level it off at the top with either a spatula or the piece of cardboard you are going to set it on to dry.  (These pieces of cardboard should be slightly larger than the egg mold.)  Place the cardboard on top of the leveled egg and turn it upside down gently on the counter.  Carefully lift the plastic egg mold off the pile of sugar.  Using a thin paring knife make a cut down thru the pointed end of the egg about 3/4" from the end.  DO NOT REMOVE THIS CUT PIECE OF SUGAR.  It will keep the end from drying out.