Wasn't intended, but what heck. I would fill a couple trays with different flavors of cool aid, and other mixers. Just add alcohol and drink fast. Real fast if you are doing a salt rim for tequila.
Wonder how jello would work?
Somewhere I have a tray that makes ice shot glasses not quite that fancy but it works. It is a hit at party's in the summer, and you don't have to worry about broken glass.
Down side is you have to start making them a couple months before. So buy a couple of them.
They don't last long when it is 100F and 90% humidity and there are 50 or so people. They aren't exactly reusable, and I don't always make new ones every day