Available in a Range of Colors & Designs
This has more to do with consumer choice and application necessity more than anything else.
The needs of the market are never the same, and that certainly holds true for LED PCBs. Given that there is always a wide range of needs for this technology, there will inevitably be a need for widespread customization, to suit that purpose.
The technological principles of LED PCBs, coupled with existing materials and advancements, allow for it to be used for a wide range of purposes, through the use of a wide range of colors, designs, and more.