A quilting store in our area is now carrying some of our buttons which I specially for them. Here are a few of my favorites that are all very large and measure around 2 inches which look great on quilted bags.
Some of these will be available in our Etsy shop as soon as I can make up some more.
Polymer clay works great for making buttons and if you are a newbie and want to learn how to make proper ones that won't fall apart in the wash as well as look good, Lisa Clarke of Polka Dot Cottage is running a free 5 week tutorial on her blog. You will find her first lesson here. Second lesson here, and her most recent third lesson here.
If you are a more advanced clayer or want to go to the next level, I have a tutorial I published called "Making Beautiful Buttons". It is available in both our ArtFire Studio as well as our Etsy shop.