Pour 1 ounce of grenadine into each cocktail glass.
Mix vodka and lemonade in a small measuring cup. This will allow you to pour it with a small stream, avoiding the colors from mixing.
Gently pour mixture into glasses, splitting it evenly.
Transfer 3 oz of blue raspberry vodka to a measuring cup. Pour it into glasses, splitting it evening between the two.
Serve immediately.
Notes
To easily make these cocktails into mocktails, you can use Hawaiian Punch, Gatorade, or even Sprite and food dye to create the colorful layers instead of using alcohol.
When adding ice cubes to your cocktail glasses, leave at least an inch or so of room at the top of your glass so that the entire drink can fit.
Chilling your liqueurs before adding them to the cocktail is an extra measure you can take to maintain the different layers of the drink.
Use a lemonade without pulp for the smoothest taste and best layering results.