For each ladybug you will need
Clean rock with soap and water. Allow to dry.
Paint your entire rock with red paint. Let dry completely.
Paint head, stripe down the back and spots with black paint (refer to the picture above).
Paint the two eyes with white paint.
After the paint has dried, spray rock with varnish.
From the black felt cut out a base. Use the pattern here and scale it up or down to the size of your rock.
Glue base to the bottom of the ladybug.