I would like to make it look like a floor with large stones.
Here is my favorite tutorial on making faux stones on cement. I hope this helps Janis: https://www.hometalk.com/36755668/faux-flagstone-patio
Janis: Maybe this will help
Hi Janis. You need to get a stencil to create the rock pattern. Use several shades of the colors of your choice. Using a stencil brush makes the job go easy. Make-up sponges help too. Be sure to choose concrete paint or stain and don't forget to seal the floor when finished. You can purchase stone stencils from Cutting Edge or even on Amazon.
Stenciled them or Home Depot sells a form to spray on