Make sure the eggshells have the opening as wide as the candles, because they will have to fit inside. Clean and maybe wash them with care before applying the desired color. Remove the membrane as well from the egg as well.

DIY Eggshell Candle Centerpiece:

• a bunch of eggshells;
• as many Tealight candles as eggshells;
• an egg holder;
• food coloring you want;
• a couple tablespoons of vinegar;

Take a bowl of warm water and combine with vinegar and the food coloring of your choice. Then dip the shell in this mix for 5 to 10 minutes and place it away to dry. Repeat the process with every eggshell and color. Finally, position the candle in each and lit it up. They look great!

Source: littleinspiration.com