I'm currently working on remodeling my bathroom. Finally pulled up the rest of the sub floor planks to discover a plumber years ago had hacked up one of the floor joists pretty bad. Work halts for the evening until I can get a 2x10 to sister up to it.
Considering building a sink vanity with the old sub floor planks I had removed. The wood is about 120 years old, and quite solid still. I've never built anything like that, so it would be an interesting project.