Chive Blossom vinegar is easy to make, and the taste in a vinaigrette on salads is wonderful. I just take a handful of chive blossoms and put them in a jar with champagne vinegar. (I like that better than most store-bought vinegars as it's fairly mild. I have to buy a case of 4 gallons to get a good price, but it lasts a long time and I use it as a base for other flavored vinegars.)
ps, I'm planning to make some blackberry vinegar soon... stay tuned!