As a Christmas gift, we wanted to build my soon-to-be in-laws a farmhouse kitchen table out of reclaimed barn board.
For the table top, I wanted to use something with a lot of character and history. The more knots, scrapes, rusted nails, the better. For the top materials, I made a trip to Historic Lumber, just north of Milton. They reclaim materials from old barns and farmhouses around Southern Ontario. Really cool stuff.
You can see the long form of this post in the Kitchen Table blog post which goes into more detail about each step and component.
Some similar projects that you might be interested in looking at.