Here's one ... you could just scale it down on your printer ....... as will be the case for the others, but at least they are starting points.
http://www.quilterscache.com/T/TheOldRedBarnBlock.html
This barn is not too much like a North American barn, but maybe you want some other farm blocks??
http://www.wilmakarels.nl/blokken.php?jaar=2003
Hip Roof Barn
https://www.etsy.com/ca/listing/9712...-block-pattern
Scroll down to Prairie View
http://sipiweskequiltdesigns.com/patterns.htm
Barn-Along
http://beeinmybonnetco.blogspot.ca/2...-tutorial.html