I'm loving these new fabric-covered buttons from Blumenthal Lansing. They're called Fabric Sensations and are new at Joann Fabrics. Very large in size, like a coat button—the black and gray are 38mm or 1-1/2" and the floral are 34mm or 1-3/8".
I bought out these two styles, although I have no idea how I'm going to use them yet. Since when did that ever stop me?
They're a bit expensive at $1.75 each but watch for their sales—you can sometimes get buttons (and other notion wall items) for 50% off.