Does the wick color show before it starts dripping? If it doesn't, you could also do gender reveal tapers, that drip either pink or blue.
Only if you don't color the tip, or the part that shows out of the candle. I've done gender reveal, green/red for Christmas, pastel for Easter, and pink for Valentines day.
Halloween you can do the drip red, but the outside doesn't have to be white, you can dip it orange, purple, and/or black. The possibilities are endless.
I've done a ton, but Halloween with the dripping red for blood or bleeding tapers/skulls are by far the most popular.
However, I will say, IF you do this, burn the candles within a year to 18 months, or the color from the wick will start to bleed/blend through the wax, and color the candle. Can still be pretty, as I've had some for several years, but they are no longer "white" tapers, they are more like pastel tie dye. LOL