LIME PIE
This pie can be made with other flavors (and colors) and small fruits can be mixed in such as mandarin oranges with orange juice, pineapple with lemonade, etc.
 
1 6 oz. can frozen limeade
1 small pkg. cool whip
8 oz. sour cream
A few drops green food coloring
8" piecrust of crushed Oreo cookies with a little butter.
 
Beat first 4 ingredients together.  Place in cooked piecrust and chill at least 2 hours.  Chocolate shavings or mint leaves can be used to decorate top.
 
Diane McCall sent in this more healthy variation:
 
Substitute 8 oz of lime yogurt for sour cream and limeade. 
You can also make it with strawberry yogurt and decorate with fresh strawberry slices.