Add 1 cup boiling water to package of cherry gelatin and stir. Add 1/4 of the vanilla ice cream and use a whisk to whip with the gelatin. Pour into a clear 9-by-13-inch pan for 15 minutes or until set. Then add 1 cup of boiling water to package of lemon gelatin. Add 1/4 of the vanilla ice cream and use a whisk to whip with the gelatin. Pour on top of the cherry layer for 15 minutes or until set. Repeat for last two layers.