That's the way I do my retro bases on my 80s and 90s models :) I paint the base green after putting sand on, then use a green shade over it and finally do a yellow drybrush. Gets that classic retrohammer base look :)

For a more modern look you can do it in greys/browns.

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Retrohammer! Some old 40k fan-art of mine (the last one is based off the work of Iron Sleet) -

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