This is a very quick and inexpensive Halloween craft for your preschooler.
Orange acrylic paint
Painters tape or Masking tape
Remove labels from the jar
Cut out shapes for eyes, nose, and mouth from the tape. Stick the tape to the jar.
Have your child paint the jar with the acrylic paint. Let the first coat dry and apply a second coat. You may want to do more than two coats. Mine turned out somewhat streaky (see pic above). To avoid this, you could mix the paint with some Mod Podge and brush it on the jar using the technique from my Beach Glass Vases.
After the second (or third) coat is dry, peel off the tape and place a votive candle in the jar or just display on your mantle without a candle.