I have the Oregon Trail blocks...still to be put into a creation, so yes, I know what you're talking about. How did you use yours...did you make other blocks to surround them or...?? I didn't see the covered bridges or the lighthouses. The quilt shop I bought my Oregon Trail blocks from was the Newport, Oregon, shop. If they are still there, you could contact them and see if they know anything. They used to carry a lot of local interest items.
Yes, I agree with lindaschipper about Tartan's knowledge! She is just amazing!!