Mix dry gelatins in large bowl; stir in boiling water until completely dissolved. Pour into 13x9-inch pan and try to remove as many bubbles as possible.
Refrigerate 1 hour or until firm. Cut into small squares.
Fruit Juice Knox Blox
Sprinkle gelatin over cold juice in large bowl; let stand 1 minute. Add hot juice and stir until gelatin completely dissolves, about 5 minutes. Stir in sugar or honey if desired. Pour into 13x9-inch pan.
Refrigerate until firm, about 3 hours. To serve, cut into 1-inch squares.
Notes
Sparkling Soda Squares - similar to the Fruit Juice version, but made by replacing the fruit juice for any flavor soda and omitting the sweetener.