We had this one at a shower I went to recently. It was delicious. You do have to make it ahead of time. The lady who made it said it's too hard to make for a large, large group (like a reception) but it's ok for a shower.
Slushy Punch
2 1/2 c. sugar
3 c. water
Boil and stir until sugar is dissolved.
Add
1 12 oz. can frozen Orange Juice Concentrate
1 12 oz. can frozen Lemonade Concentrate
1 46 oz. can pineapple juice
3 c. cold water
Stir until the frozen juices are dissolved. Then pour into cake pans or other shallow pans. Freeze overnight. When frozen, cut into chunks and put into gallon ziplock bags.
When ready to use, put the chunks into a large (2 gallon) punch bowl. Pour 2 2 liter bottles of 7-Up or Sprite over the frozen chunks. Stir until the chunks break up and mix with the pop. It will look like frozen applesauce. Tastes yummy.