>>10074718came here to say this. The alien series was awesome. The top left one from picrel was my favorite.
Also, you got them from stores when you handed them Coke bottle caps and they were marketed as ice cubes, as in you could put them in your freezer and then cool your drink with them, hence the name "Hielocos" (like crazy ice in Spanish). I tried to do that but it never worked very well lol
