I consider each, a tiny piece of art that can go with you anywhere. Most are created with the same process as their larger counterpart.
The glass used in most is a bit different, it is called dichroic glass. Dichroic glass is a special kind of glass that has melted Quartz Crystal and/or Metal Oxide coated on glass in a vacuum. This creates a sparkle and glow to the glass. Some even look metallic.
Some have a glass enamel image fused into the glass, while others are hand painted and some a little of both.
A few of the larger pieces can be used as ornaments on small trees or hanging in the window to catch the light.