We are in the middle of installing siding on one of our current projects. To match the siding details on an existing building on the property, we are using a combination of corrugated Cor-ten and board & batten. Cor-ten is a really neat material that is used for both roofing and siding. The material that we use is 22 gauge and will start rusting immediately. It is a steel alloy that was developed to form a protective rust covering relatively quickly. The rust does two things: it gives it a nice red patina, and it eliminates the need for a protective coating. It also fits right into the traditional farm house aesthetic that we are shooting for on this house. The combination of the Cor-ten and our board & batten siding is looking fantastic (see pictures below)!
A quick note on board & batten: it is a look that, in our area of the country, is most typically done in our area on barns and rustic outbuildings. However, I believe that with special attention to the flashing and trim details, it can still have a subtle elegance. The pictures below show some of those trim and flashing details.