While growing up, I've tried a variety of craft projects, and one of my favorites has always been making knot Rosaries. I find making knot Rosaries to be very condusive to silent prayer and reflection, and you can do many great things with the Rosaries you make.
Knot Rosaries are very durable (when made properly), they feel great while praying the Rosary, the Divine Mercy Chaplet or other devotional prayers on them, and they look very nice. So far, none of the Rosaries I've made and given away or sold have had any problems falling apart, even after a few years of use! As an additional benefit, they are not very hard to make, and the supplies you will need do not cost very much at all!