often underestimated, the bone folder has become one of my favorite craft tools. it allows for sharp creases to be made on paper for neat folding. mostly used by bookbinders, the bone folder comes in handy when i need to burnish things and fold pieces of paper. and did you know you can use it to mark fabric without damaging it? my bone folder sits in my cup of pens and pencils for easy access. i use it that much!!image from here where martha gives instructions on how to use a bone folder.of course martha stewart makes a great one, sold at michaels. i'm not all that partial to a particular brand. i usually pop into an art supply store and pick one up. tell me, what are your favorite craft tools?