Gather all of your partly used candles and place them in a metal coffee can or a pan that you can just use for melting candles in. Melt the candles down in a double burner style, coffee can inside a bigger pan with water boiling in it. Remove all of the wicks with a fork. Place a longer, new piece of wick into the center of the mold that you are using as you pour the wax into it. When the wax cools and sets completely remove it from the mold. Now you have a new bigger candle. You can get
Candle Wicks online for a pretty low price. This is a great way to always have candles of a good size and not throw any candles out. Melt them down and reuse the wax.