What are acrylic skins?  

Acrylic skins are essentially the dried paint that is left over from using acrylic paint. The plastic-like consistency of acrylic paint lends itself to making “skins” that can be peeled from plastic containers in sheets. I always found it cathartic to peel  the dried acrylic paint from my plastic pallet.  Pour painters can utilize the drippings from their pour painting by collecting the drips in a plastic pour box or from silicone mats. When dried, simply peel the skins from the surface to make various craft projects.  A favorite project of mine is to make acrylic skin jewelry. You can still make acrylic skin jewelry without pour painting.  Essentially, lay down a silicone mat and pour your acrylic paint in the design you like on the mat and let dry.  The paint should easily peel up so that you can use the skins.