DISSOLVE 1 pkg jelly powder in 1 1/4 cups of the boiling water.
POUR 3/4 cup of the jelly into 8 cup ring mould. Chill until set but not firm, about 15 minutes.
CHILL remaining jelly in bowl until slightly thickened; gradually blend in 3 Tbsp. of the sour cream. Spoon over jelly in mould. Chill until set but not firm, about 20 to 25 minutes.
REPEAT with remaining jelly flavours.
CHILL until firm, about 2 hours.
TO unmould, dip mould in hot water for about 10 seconds. Gently pull jelly from around edges with moist fingers. Place moistened serving plate on top of mould. Invert mould and plate; holding mould and plate together, shake slightly to loosen. Gently remove mould and centre jelly on plate.