Well designed barn quilts in the 96"x96" to 120"x120" range will sell for a few hundred dollars all day long here in Kentucky. A diligent worker could probably make two or three of them in a week. They are NOT a quick project.
http://www.google.com/search?q=barn+qui ... client=img
Barn quilts are very popular here! They are usually made in four panels, 4x4 or 5x5 panels that are attached to a barn either butted together, or slightly overlapping one another. They are most commonly square, but I have seen barn quilts that are rectangular and even round.
I had toyed with the idea of using DesignEdge to create a barn quilt with 12" to 16" square panels, and shipping the "kit" via UPS to all parts of America, but I never followed through. The smaller tiles could be attached to 4x4 sheets of plywood or another outdoor board like PVC panels, and hung as four segments. I would include thin stainless steel backing plates with the holes aligned for easy assembly, and top and bottom tabs for attaching the quilts to a wall.
I could make them using a router and colored acrylic panels, or colored PVC panels, or simply drawing the design with a pen and then hand painting them, using stencils and spray paint. Each stencil would be the shape of a particular segment of the quilt.
Random, colorful quilts sell well, but some people want specific colors, or a specific theme, that may relate to the farm's history, or a family crest, or something else of personal importance to the client.
When I build my 5x10 laser table this Spring, I may just go after the barn quilt market!
Joe