Sand the golf balls all over the surface with a sandpaper and spray primer paint for the final paint to better adhere on their surface.
When the primer is dry, apply a red paint all over the balls and then black paint to make the ladybug head.
At the end, add varnish to protect the balls from water.
Now, have a walk in your garden and place these ladybugs :)
Updated on 2017-02-25 - Images from Amazon API. Amazon and the Amazon logo are trademarks of Amazon.com, Inc. or its affiliates.