I've made a lot of table runners and table toppers recently as gifts and always have small pieces of fabric left. I thought it would be neat to make matching coasters. What do I use as the middle? Do I use regular batting or something more absorbent ( a towel cut up)? I have found that people like the pieces Scotchgarded. I know the fabric is colorfast but does Scotchgard do anything weird to the batting? Thanks for your help!!