This is really cool and it is the third time this week that I have come across 'paper bag flooring', I wonder if the world is trying to tell me something. I am redoing a little pool house into a tiny house this Spring and I like this idea. My plan was to paint the new plywood base floor and then use the wood grain roller (probably like your mother has) to make contrasting grain and then seal it all. I like the idea of the paper bags though.