How do I upcycle old candles?

You can melt the remaining wax and combine all the candles, then repour it with a new wick.

Rosann....They can be melted and remolded. Use mason jars, empty candle jars...anything that will hold the hot wax. Buy wick at craft store and cut to length you need. Wrap the wick around a pencil and rest on the holder until it dries. Good luck

14 ideas here:

https://www.bobvila.com/slideshow/14-new-uses-for-old-candles-49805#silence-squeaky-doors-and-drawers-with-wax

My husband takes the old scented candles and puts them in his truck of his car. The smell permeates thru the entire care, especially in the summer. Smells Great!

Clever ideas here:

https://www.quickanddirtytips.com/house-home/diy/9-genius-ways-to-reuse-old-candles

https://www.hometalk.com/diy/craft/candles/rebatching-old-candles-41841495

There are lots of ideas here on repurposing old candles and also candle jars:

https://www.hometalk.com/search/all?filter=Candles%20in%20Upcycle

You can melt them and reuse them again.

This is a good tutorial on how to re use candles: https://m.youtube.com/watch?v=TmsKTLd7wpA

This is another tutorial: https://m.youtube.com/watch?v=z1W27JMWe3A

Melt them down and make a new one from the wax and a little string.

Melt them and use as seals , or make a new ones. You could decoupage on them too