Fabric Coasters

I recently acquired a few bags of fabric scraps and have been devising things to do with them. One thing that we always need in our house is coasters; making coasters has been a project of mine since we moved in, but I could never really figure out an effective method. We did purchase some cheap plastic and cork ones, but I'm pretty sure the plastic scratches the glass coffee table. I tried sewing together some squares of fabric, and I think they're great as slightly rustic drink coasters. They work well to soak up condensation, and they don't scratch glass or wooden surfaces. I'm thinking of making some backed in felt and selling them in sets of three or so.