Glass ornaments, such as the ones that are used today, were first used as Christmas decor in Germany in the mid 19th century. Today, the ornaments are used because of the look they provide.
Their shells look like their environment. They blend in by hiding in their shells.
You can look just about anywhere like Wal-Mart or Walgreen's for ornaments. They have all sorts of different kinds. Just look for any that are made of plastic so that they will not break when they fall.
Zebra mussels have stripes.
pointy shells
it is a sponge that is made out of glass meterial.it's not glass,but it look's like it.
Like a glass house - so sunlight can get in.
Fish Whales Worms Turtles Stars Shells
God made them that way
it looked like ostrich egg shells and there weapons were bows and arrows
Baby snails look a bit like worms or slugs upon hatching. They do not have visibly noticeable shells for a day or two or until they can be viewed up close on the glass.
There are many companies and websites that offer transparent Christmas ornaments or sale. Some of these companies that offer ornaments are Factory Direct and Miles Kimball.