Mix 2 cups of boiling water and the lime jello in a bowl.
Add the Margarita mix, Tequila and Blue Curacao to the jello mix. Stir well.
Pour the jello mixture into the jello shot cups.
Chill in the refrigerator until set, 2 - 4 hours.
Notes
The cookie sheet is not absolutely necessary but it does make transporting the jello shots to the refrigerator much easier.
Using a bowl with a spout will making pouring the jello into the shot glasses much easier.
Waiting until the jello has cooled before putting the lids on the jello shot cups will prevent condensation from forming inside the shot cups. While the water doesn't harm the jello shots, they look better without it.
You can make fewer jello shots by using 1 small box (3-ounces) of lime jello and using half the amounts for the rest of the ingredients