Here's some I found...
a cow fabric panel
http://www.sarahj.com.au/product_info.php?products_id=1593&osCsid=25470008c71506da6d12fdee6
this one is way cute...actual cows in a poppy field fabric...
http://www.jandofabrics.com/proddetail.asp?prod=ani000257
"moo" fabric..
http://www.jandofabrics.com/proddetail.asp?prod=ani000259
way cute cartoony type cows...
http://www.uquilt.com/fabrics_detail.asp?itemID=TTC9684
Hope these help you!