2 cups sugar
8 cups water
1 (12 oz.) can frozen limeade
1 (2 liter) bottle 7-Up or Sprite

Combine sugar and water and heat slightly until dissolved.  Add frozen limeade.  Mix and pour into heavy 1 quart zip lock freezer bags (about 3 or 4).  Freeze.  When ready to serve (about an hour before) place in punch bowl and break up slightly with a potato masher.  Add chilled 7-Up and mash until slushy.  Can float cut up limes or cherries in slush if desired.