As requested by a visitor to the site, here are 6 simple steps to create the bases that I’ve shown in my previous imagery. I selected 6 models to show each stage of the process.
To begin, add some sand or similar to the base. You can either glue it on with PVA and then paint a watery later of glue on top once it has dried, or use superglue if you want to get the job done quick. Add the sand in patches by applying small areas of glue and then dipping the model’s base into your tray of sand.