What a great idea for a gift for your favorite seamstress or quilter. Use an extruder to make polymer clay "thread" that you wrap around a regular metal sewing bobbin. Make into a necklace and there you are. This is made (and beautifully) by Clafoutine
Easy To Make Stone Art - write message on rock with pencil, Use Dremel w/grinding stone, run over pencil mark once to create groove, go over three times or until you reach desire thickness. - now I just need a dremel.