These are my favorite three mix drinks, two are regular and one is alcoholic.
Suicide- Mix in a medium cup, Pink lemonade, regular lemonade, HI-C fruit punch, Root Beer, Coke and Sprite. It's awesome! It tastes just like bubble gum.
Sweet Tart -(The only place I can find that has all of the ingredients for this one is Taco Bell) Take a large cup and fill it in equal parts with Mountain-Dew Baha Blast, Root Beer, Lemonade and Pink Lemonade. I swear it tastes JUST like sweet tarts! if you add more lemonade and Root Beer it tastes like shock tarts.
The last one is alcoholic but it is SO good! You take a quarter of a glass of whipped cream vodka and mix it with orange soda. It tastes just like a Flinstone Push Pop icecream...but with alcohol in it!