Put candle in and light. Shadow from flame might make a cool pattern.

This will need supports and will probably require a resin printer.

Uniform scale as needed. Put things under candle as needed to get the right height for the shadow.

The bottom flat area is about 20mm (sorry I didn't really care to use human measurements while making this), so if your candle is 40mm in diameter, print at 200%

You can try it on an FDM printer, I did and woke up to spaghetti. Use "Print thin walls"