A snow cone's a snow cone, just some finely shaved ice swimming in flavored syrup. There's not much room for a snow cone joint to distinguish itself from the competition — or so you assume until you hit up Aunt Stelle's. Somehow, the Oak Cliff landmark makes its just a little better than anyone else. Maybe it's the history, all 51 years of it on the same corner. Maybe it's the way the whole experience makes a summer afternoon seem so luxuriously carefree. Maybe there's something extra in an Aunt Stelle's cone. Whatever it is, get your fill while you can. Lee Albert and husband Ed Schwartz, who have run the stand since taking over from her mother, have promised to keep it open only as long as their health holds up. The Old Oak Cliff Conservation League, after Aunt Stelle's cut its hours to weekends only, saw fit to put it on last year's Architecture at Risk list. Here's wishing the couple eternal health.