Hey all, I'm working on a project to create exfoliating body sponges. Could you give me some suggestions of materials I could use which the following characteristics: Customizable exfoliation level (from very soft to very harsh) Could last up to 4 months after daily use Would create enough soap lather Customizable in terms of colors and form Something bright and fun, flexible like this (http://www.sephora.com/precision-pore-cleansing-pad-P262041?skuId=1233691) would be great but would like to explore other materials besides silicone. Any suggestions? Thanks, ValenRL