A simple hide in a parking lot. Indigo is the name of the cache, not the color of the container.
A simple cache that might help you find other challenge caches. There are many challenges out there that require finding caches with a color in the name of the cache. Some challenges require any color and some require the seven rainbow colors. Indigo is the hardest to find, so here is a simple one to help you along. The container is a bison tube, magnetically attached to its hiding spot.
Congrats to croling for the FTF!