I thought of something else, specific to candles, you can use the surface of the candle body as a canvas that adds to the working. E.g. carve a sigil on the candle, enchant it, “dress” it with magickal oils and herbs, some people match the candle color with a symbolic meaning etc.
So yes this is also an option.
This principle is used heavily in “candle magick”, for which you can get whole books. We have a popular thread going on right now that gives an example of this:
So it comes down to personal choice on how you design the ritual, what you want to do with it and the tools you choose to work it.