Barnyard Birthday! Pig pen game, We filled garbage bags with pink balloons and released them into the yard. The kids had to corral them into the pen (which I built out of a wood from a swingset my neighbor had at the cub for the garbage truck!). They were running around having so much fun as the wind blew them around the yard!
Pig Stomp. We did this at Ethan's Mario party with brown balloons (Goombas) and put coins inside. The followup game is how many bits of balloons can you pick up and whomever gets the most is the winner!