This tip, sent in by Bill Hughes, is possibly the easiest I’ve heard but it’s great for making statues.
For OO scale railways, take a soft drink bottom top and cut it in half (so it’s shorter). Next bye an O scale figure and glue to it the bottle cap. That’s it.
For N scale, use a smaller bottle top (or a toothpaste lid) to make the plynth and then use OO scale figures.
Paint them grey (for concrete/stone or dark brown for bronze) and you have a statue.
Bill said he got this from a friend in the 70s so where it originally came from is unknown but it’s a simple, effective, idea for adding interest to parks, recreation grounds and traffic islands.