We found the best rocks were about one inch long and not quite as wide. It can be any type of rock.
We tied string, ribbon or yarn around the rock like you'd tie a package - criss-cross on the back, then flip it over and weave the ends underneath. Then tie a knot or two.
You could paint the rock before tying it if you want to keep the string from getting painted. But we wanted the string to blend in to the rock, so we painted it afterwards.
Hang the rock necklace to dry on a twig or other hook.
The beads and buttons cover up the places where the paint smudged the ribbon, string or yarn, pluse they look great!
Optionally, you can also varnish over the paint, especially if you used a washable paint and want to protect your clothing from any paint smears in the rain.