1 (3 oz.) pkg. lime Jello
3/4 c. boiling water
2 c. ice cubes
1 c. Cool Whip

Dissolve Jello in boiling water, add ice cubes for 2 to 3 minutes to start thickening, remove unmelted ice. Set aside 3/4 cup of the gelatin mix. Thoroughly blend Cool Whip into remaining gelatin. In individual serving cups, alternately spoon in Cool Whip and gelatin mixture, and plain gelatin mixture. Zig zag a knife to marble filled cups. Chill at least 1 hour.