Have you tried making a living moss floor?

I'm working on my PDC final and contemplating using moss as a sort of living rug for an indoor space, kind of dreaming about the sleeping space, but also potentially a kitchen/communal building. Have you tried it? Know anyone who has? Pros and cons? Thoughts on implementation? This is currently theoretical, but I'd love to do some actual experimenting when I finish.

I once tried to establish a moss and flagstone path outside. I spent weeks carefully digging up and transplanting moss to tuck between the flagstones. It all died.  

Then i made a couple of moss bathmats for the bathroom because a blog post caught my imagination.  Moist environment,  low light, etc. Two things happened. One, it was unpleasant to walk on the moss.  I was surprised by that but I constantly stepped around it to avoid the squicky feeling.  Also, the moss all died.

So I love the idea but the reality has not worked out for me.

Moss outside can survive and even thrive if it is in a location where it doesn't get much drying sun. The north side of a building and/or tree-shaded areas are possibilities. In most places where people will want to be, moss will not do well. Deep shade on the edge of a lawn/field may be an exception. It also needs to be a place where dead leaves will not naturally accumulate and cover the moss.

As far as indoors, Rob has it right. I used a large flagstone that had a patch of lichen on it as part of my stone entry floor. Lichen needs drier conditions than moss can handle, but even that died after a couple of years... longer than I expected, really.

If the rooms you are thinking about get sun every day, you might consider thyme instead of moss.  Elfin thyme and creeping thyme feel wonderful on bare feet. I have concrete stones covered with these two varieties. Thyme doesn't grow fast, but spreads very year.  It's tricky to grow from seed, which is probably the only way this project would be affordable.  I've always planted starts, cut them in half.  Worth trying from seed.  Thyme doesn't need near as much water that moss would and it handles light traffic well.  I wouldn't try it in a kitchen, too much traffic.  Very interesting idea, you've got me thinking about using it in rooms that transition from indoor to outdoor.