There are mini niche markets on the Internet however one niche that not too many folks are aware of is the Craft Christmas Lights market. There are lots of "crafters" that have a need for short mini light strands with no end connector. These Craft mini lights come in sizes ranging from 15 to 35 lights and have the unique feature of NOT having an end connector at the tail of the string. This allows the mini light strand to be placed in wine bottles, glass blocks and other decorative items to create wonderful displays.
This glass block is an example of how these craft lights can be used to create a beautiful display.