My grandma used to always serve this whiskey slush around the holidays...so that is when I think about making it.
This is a great drink to make because you just mix it up and freeze it, and then pull it out of the freezer when guests drop by. In between uses, you can pop it back in the freezer. I made this lots of times for my bunco group when I lived in Texas...and everyone loved it! Of course we were playing bunco and having a night out, so it stands to reason it was a hit.
Anyway, just spoon slush into cups (half slush/half soda) and then add 7-up, sprite, or ginger ale.
Southern Living has a version called Slushy Whiskey Sours here.