Decide which side of the jug will be the front, where your monster's face will go. Turn the jug over to the other side and cut the bottom of the jug, about 2" from the bottom, in a horizontal line. Do not cut the entire jug open, just about a third of the way around, enough to open it. This will give you access to the light. Repeat this process on the Sunny D jug as well.
Paint the Sunny D jug green and the milk jug yellow. Let the paint dry completely then paint each jug with a second coat.
If you milk jug has circle indents in the side, that's a great place for the eyeball! I left mine unpainted when I did the yellow, then painted the indented circle white. If you jug doesn't have the indents you will simply paint the eyeball on instead.
Yellow Monster
To add the polka dots to the yellow jug, use the two spouncers and red, purple and light blue paint.
Simply dip the spouncer in the paint, remove excess by gently pressing onto plate or scrap paper and twirling. Then just place spouncer on jug and gently add pressure.
Use the larger spouncer dipped in orange paint to the add the center of the eye.
Dip large paintbrush into black paint. To create the eyebrow, bounce the paintbrush straight up and down across the top of the eye.
When the orange is dry, use the smaller spouncer to add the black of the eye.
Use the white paint pen (or a pencil) to draw on teeth. Fill in with white paint using small paintbrush. Use Sharpie marker to add the mouth line. Set the yellow jug aside to dry.
Green Monster
Use the large paintbrush to add the monster's hair. The hair will take up about 1/3 of the jug. Paint on the eyebrows.
Use the Sharpie marker to draw on the mouth, eyes, nose and stitches. When using the marker, use a light hand. Pressing too hard with the marker will tear through the paint.
Add the whites of the eyes then dot on the black with the handle end of the small paintbrush.
Carefully draw over the stitch lines again with the marker for a second coat.
When everything has dried, give the jugs a coat of sealer. Let dry 20 minutes before applying a second coat of the sealer.
Press some wall putty to the bottom of a tap light. Insert the tap light inside the jug and attach it to the inside top of the head with the putty. Push the tap light to turn on. You could use a hot glue gun instead of wall mounting putty if you prefer.
Insert a broom handle or sturdy stick into the jug opening. If the stick is much smaller that the opening, causing the jug to wiggle around, take a sheet of felt and fold it in half. Place the felt on top of the stick then push the opening of the jug over the top of the felt and stick. This will fill the gap and give the jug stability.