Check this out for a story on how the Iowa folks designed/registered their tartan.

http://www.haggis-iowa.com/iowa_tartans.html
Beerbecue, many thanks for this link. I contacted the lady listed on the site, and now my mom will have an Iowa tartan sash for Tartan Day -- Mom was born & raised in Iowa, and she was tickled pink to find that Iowa has a tartan!

Cheers,

Todd