The easiest way to make colorful stepping stones was taught to me by concrete artist, Terri Ryan, who make many, many indoor and outdoor ornaments from concrete. Without a mold, she simply adds a thin layer of concrete to the top of a purchased round stepping stone and stamps a circle or two into the concrete before it sets. She then uses stain for concrete floors--which comes in small bottles and bright colors--to paint her stones. The tops of the stones are very smooth and rounded (no edges to break off) and look really nice in her garden. The stain fades over time, so it needs a touch-up every 2 to 3 years.
Unfortunately, it's difficult to find round stepping stones these days at the large home improvement and hardware stores. So I decided to make my stepping stones from scratch. I was lugging home a 94 lb. bag of Portland cement anyway, so I had plenty to make a whole army of stones.
Step 1: What you need
94 lb. bag Portland cement
50 lb. bag of masonry sand (enough for six stepping stones)
12-inch plan saucers or stepping stone molds
plastic bucket or trough
cans from the recycling bin, various sizes
long stake for stirring and leveling
cooking spray or petroleum jelly
cement stain (Smith's Color Floor comes in bright primary and secondary colors)
1 yard of 1/2-inch hardware wire
For an impromptu work surface, set up two saw horses, place a large piece of scrap plywood or boards on top, then cover with large garbage bags.