I'm also a big fan of dirt on my feet, even though I'm mostly a clean and hygienic person. There's just something about feet that looks beautiful when they're bare and naturally dirty. It's a nice contrast that further highlights the beauty of barefoot living. Moreover, dirty feet are an icon of barefoot people, and I show the public that I have chosen to be barefoot and enjoy it.
I too really like getting and keeping my feet dirty... the blacker my soles, the better, but also a bit on the tops too from resting the sole of one foot on top of the other. I agree that feet look best when dirty. While I do shower and my feet get wet, I never actually explicitly wash my feet. I also go to bed with dirty feet. The dirt doesn't really rub off easily. It's great to wake up with feet that are still dirty getting a head start on the new day's barefooting. I also agree that dirty feet are a sign of a barefooter.
Yes, sleeping with dirty feet is a priority for me too. I never wash my feet on purpose, only when they get wet when I take a bath or when I'm barefoot in the rain. I like the dirty feet fashion!
I went to the gas station and then I went to Walmart to get a few things and my feet got a little bit dirty. I wanted my bare feet to get super dirty.