Barnyard Bash Farm Animal 1st Birthday Party Supplies. The best 1st Birthday Party Ideas start with a great 1st birthday party theme, so for a fantastic Farm Animal themed 1st Birthday Party, start with our amazing selection of Barnyard Bash First Birthday Party Supplies. Barnyard Bash farm animal theme makes for a great First Birthday party idea and for an amazing Birthday Party! Have a party to remember this year with a terrific First Birthday party theme featuring Barnyard Bash! Great Birthday Parties start with Great Birthday Party Supplies!