After discontinuing packaged 1-2-3, Jell-O came up with a sort-of-scratch version. Word on the Internet is that the mixture frequently separates into two layers instead of three.
1-2-3 (as revived by Jell-O)
Serves 4
1 pkg. (4-serving size) of any flavor gelatin mix
3/4 cup boiling water
Ice cubes
1/2 cup cold water
1/2 cup thawed whipped topping (Cool Whip or similar)
Dissolve [...]

This is a great Jell-O salad. Adding fruit cocktail, and marshmallows takes this simple fruit Jell-O salad to a new level.
3 pkg. Mix Fruit Jell-O (3 oz Pkg)
3 C. Boiling Water
2 1/2 C. Cold Water
1 Can Fruit Cocktail (14.5 oz drained)
1 C. Flaked Coconut
1 C. Miniature Marshmallows
Place Jell-O in a mixing bowl add 3 cups [...]

Be creative you can use green and red for Christmas, orange and green for Easter.

The addition of cottage cheese and pecans makes for a fine gelatin salad. This isn’t too sweet and is perfect for a meal.

This is a delicious and colorful Jell-O salad that has three different types of Jell-O inside of it along with marshmallows, cream cheese, and whipped cream.
1 pkg. (3-oz.) each red, lemon, and lime Jell-O
1/4 C. miniature marshmallows
1 3/4 C. hot water
1 small can crushed pineapple, drained
1 8-oz. pkg. cream cheese
1 C. whipped cream
Dissolve red and [...]