I'm selling these cuties at my Etsy shop--come check it out!
As you can see, these pieces are pretty darn huge, so this is a great set to use with a large crowd where visibility might be an issue. And of course you're not limited to just singing Old MacDonald with these pieces. Adapt songs like The Wheels on the Bus (The Chicken on the Farm goes cluck, cluck, cluck...) Make up stories using all or some of the animals... Play rhyming games (I'm thinking of an animal, and her name rhymes with that thing we wear outside in cold weather...)
Here are some farm themed books that might work well for you, too:
Clip Clop by Nicola Smee
Hurry, Hurry by Eve Bunting
How Kind and I Kissed the Baby by Mary Murphy
Old MacDonald Had a Farm by Jane Cabrera
Big Red Barn by Margaret Wise Brown
Mrs. Wishy Washy by Joy Cowley
Spots, Feathers and Curly Tails by Nancy Tafuri
Bridget is hosting the roundup this week. You can also find tons of ideas at Flannel Friday's Pinterest Pages, the Flannel Friday Blog, and Flannel Friday's Facebook page. And come on over to my shop to check out lots more sets for sale: Flannel Board Fun!