STEP 1: First, wash each container and dry thoroughly. Choose a sturdy twig that's slightly shorter than the jar and hot-glue it to the inside of the lid, so that the twig sticks straight up.
STEP 2: Hot-glue plastic bugs to the wood — making sure the decorations are small enough to fit inside the glass when you seal the terrarium.
STEP 3: Spray-paint everything but the jar — twig, bugs, lid — white or black.
STEP 4: Once the piece has dried, hot-glue green floral moss around the base of the twig. Carefully place the jar upside down over the lid and screw it on.
Original craft post can be found here: http://www.countryliving.com/crafts/projects/terrarium-halloween-crafts-1009