Paint the bowl inside and out.  Use two or more coats of paint for a brighter "glow 

For the tentacles, cut 10 - 12 pieces of yarn approximately 36 inches in length. Place them in a zipper sandwich bag with several squirts of glow paint and seal the bag. 

Squish! Squish! Squish! until the yarn is completely covered, adding more paint if necessary. If the paint is too thick, add a little water to the bag 

Hang the yarn to dry 

At the center of the bowl, punch two holes about 0.5 inch apart using a skewer or sharp pencil 

Cut a piece of yarn approximately 40 inches long.  Thread it through the two holes so that both ends come out the bottom of the bowl 

From the inside of the bowl, pull the yarn up to form a small loop.  Thread the tentacles through and roughly center them under the loop 

Flip the bowl, pull the yarn taut and tie a double knot 

Back on the inside, grasp the tentacles as one bunch and tie a single knot 

The frilly appendages flanking the mouths of some types of jellyfish are called oral arms.  To recreate these, unravel a few pieces of yarn that hang close to the center of the bunch 

Charge your jellyfish creation in bright light for at least 30 minutes.  Turn out the lights and enjoy its luminous glow