Mix 1 large instant Lime Jello, add 1 cup boiling water (dissolve the Jello in that first), and 2 1/2 cups of 7up or lemon lime soda. Fill fancy cups 1/2 full of plain Jello and chill. Mix the reserve Jello with 2 scoops of lime sherbet and chill in a bowl. When the cups are set, spoon the Jello, Sherbet mixture on top and continue to chill. (4 hours total) Top with Whipped Cream and a cherry or a few sprinkles. Yummerooo.