Making these was really easy: mix 1/4 cup gelatin into 4 cups hot water, stir until completely dissolved, then add in 4 cups of liquid soap and any glitter/food coloring/scent if you desire. Place in the refrigerator for the gelatin to set. This amount filled four snow globes (2 cup capacity), but you could also put the jelly soap into ice cube trays/moulds or a pan to cut into pieces. If you are adding glitter you will occasionally have to mix up the solution before it sets because the glitter settles to the bottom (or in my case the top since I had the globes upside down so the air space wouldn't be visible).
The jelly texture is kind of fun and strange and it can be used as a bubble bath. However, you won't get the great movie-style-long-lasting-bubbles from this, but I've never had a bath with that kind of bubbles. Do they even exist? Are there people on set constantly adding more bubbles between takes?