(optional) small pieces of flower petals or scented oil
(optional) food colouring
Clean the shells well.
Take the wick out of the tealight candle and place it inside the shell.
Heat the tealight candle (do it in its metal case to make it easier) until the wax is melted.
(Optional) Mix in the oil or flowers into the wax for scent. You may also add the food colouring to colour your wax.
Pour the wax into the shell.
Once set, you have a shell candle.