As you can see, I sewed a block for Linn. I bought a quarter yard each of the three loudest heavyweight fabrics I could find in the clearance section at JoAnn, which cost me less than a dollar. Between the fabric, polyfill, and the plastic Easter egg filled with dried beans that I put inside to make it rattle, the whole thing cost me about 50 cents. It also took about 15 minutes to make.
I would have highly recommended this project if you were looking for something to give to a baby, but naturally mine has zero interest in it.