Mom -
Arbitrarily sticking numbers in the middle of sentences doesn't make them multiple questions! I give up, I am just going to make things up now.
Juise, to answer fully and completely your few and totally reasonable questions, I have decided now that I would like to install a path to help reduce the number of expensive steppable perennials I will have to use. I am looking for steppable ideas to use in the path, and would like to fill the rest of the area, (which is mostly shade with limited afternoon sun,) with other low growing perennials, including ground covers to make the coverage easier.
Ah, nice answer, Mom! Thanks for getting back to me so clearly and concisely. Now, since I believe you previously stated that you mostly wanted to set it and forget it, I would encourage you to consider native Michigan perennials. Not only are they best suited for our climate and pretty well take care of themselves, they are also best for the local wildlife, in this case mostly wild birds and insects. Native plants are very low maintenance, beautiful, and set to thrive in your environment with minimal effort.
You said it is wet, right?
Uvularia sessilifolia L. - Spreading bellwort
Sanguinaria canadensis - Bloodroot
Mitchella repens - Partridgeberry
Dicentra cucullaria -Dutchman's breeches
Cornus canadensis - Bunchberry Dogwood
Asarum canadense - Wild-ginger
Ranunculus septentrionalis - Swamp Buttercup
Phlox divaricata - Wild Blue Phlox
Chelone - Turtleheads
For in the path, aside from wooly thyme, you could use any number of native mosses, Alpine Violet (Viola labradorica), or Pussy toes (Antennaria dioica).
There are also native ferns you could use that are good with shade and wet soil, and which you used would depend on how much you want them to spread.