What is Jelly Cube slime? Jelly Cube is inspired by the gelatin type of desserts brought to family celebrations that celebrates warmth, togetherness and the enduring qualities of a family. It texture is special, unlike Brighter Tomorrow other clear base slime the cubes adds more of a squishy feel to it. Making this a very fun slime to try. Once you try this slime Brighter Tomorrow is confident you will want more of this type of slime.