Clean a Mason jar and allow it to dry completely. Remove the lid and set it aside.
Fill the bottom of the Mason jar with sand; either use traditional sandbox sand or use colorful sand to add to the decor. Fill the jar until approximately 1 inch of the bottom is full of sand.
Shake the jar gently to distribute the sand evenly in the bottom and make it level. (Omit this step if using layers of colored sand.)
Insert a votive candle or a small, portable LED light into the jar. Light or turn on the Mason jar light and dim the house lighting for a romantic dinner.