Mix a bit of food coloring and glitter with Mod Podge. Stir to combine. Paint the inside of the mason jar with the Mod Podge mixture.
For the other jar, I started off by painting on some Mod Podge in spots, then sprinkling my glitter on top. Then I added some more Mod Podge in spots and sprinkled more glitter.
Add a tealight to the lid of the mason jar and screw on the base to display.