meringues out of 7 minute frosting?
You probably know by now. It very well may work, as the ingredients are pretty much the same. Was there water in your recipe? There should have been to make the sugar syrup. Meringue doesn't have that component, so it may take your "meringues" some time to dry out in the oven, or they may not ever. Boiled icing is not as stiff as meringue.
If anything, it'll be fun experiment. Let us know how they turned out.
They turned out ok.... yes, there was water in the icing recipe. but they dried out just fine! there was also a lot more sugar than in traditional meringues. so they caramelized a bit and turned slightly tan. which was fine.... husband says they taste like toasted marshmallow. if i have leftover 7 minute frosting, i'd most definitely do it again.