IN a medium bowl, combine 3 (3 oz.) boxes of JELL-O Cherry Flavor Gelatin and 4 envelopes unflavored gelatin. Add 4-½ cups boiling water and stir 2-3 minutes or until completely dissolved. Pour into 13 x 9-inch pan and place in refrigerator for 4-5 hours or until firm. Repeat with JELL-O Berry Blue Flavor Gelatin.
AFTER JELL-O is set, cut into small squares. Add a few pieces of Berry Blue JELL-O to the bottom of 10 (8-oz.) jelly jars. Add COOL WHIP to a resealable bag and pipe into jar on top of JELL-O. Top with a few pieces of Cherry JELL-O. Add more COOL WHIP and sprinkles if desired.
TO serve in jars, add the lid and tie with twine; add a small spoon.