Dissolve lime gelatin in 1 c. hot water; add grapefruit juice. Pour into a shallow pan; chill. Dissolve cherry gelatin in remaining 1 c. hot water; add orange juice. Pour into a shallow pan; chill.
Soften unflavored gelatin in ¼ c. cold water. Heat pineapple juice to boiling; add softened gelatin and stir until it is dissolved. Chill until mixture thickens (a lit