If you have small children coming for a meal, they will enjoy this.
Two Tone Jello
2 packages Jello, different colors
Prepare the first package of Jello according to package directions. Pour into a shallow pan and chill in the refrigerator until mostly set, but still slightly tacky.
Prepare the second package of Jello according to the directions and refrigerate 20 - 30 minutes until no longer hot, but not set. Pour it carefully over the first layer of Jello and chill the whole thing until set.
That's it. Unless you want to get fancy and put some whipped cream or Cool Whip in one of the layers. You can also try propping up the pan for the first layer so it sets on the slant, then chill the second layer with the pan flat.