Not a “new” product, but one that may be new to you.
For an easy unfired marbleized finish on ceramic bisque or most any other item, you may want to give a try using Magic Dips.
Simply float specialized paints on surface of water and lower your piece into the surface, twisting your item as you submerge it.
Anyone, any age can make beautiful, decorative pieces.
Try combining this product and technique with other fired finishes and come up with some really spectacular designs. Use your imagination.
Have some pieces that did not quite turn out like you want or cannot be fixed? Just marbleize them, it will cover most any errors.
For more information on this product:
http://www.bcdservices.com/magicdip/store/commerce.cgi?next=42&cart_id=1246559281.54984&product=Individual_Colors