We have so many blackberries right now, and I love making jam, but without all the added sugar. You can't use regular pectin when cooking with Splenda, as it requires real sugar to set. However, there are low and no-sugar pectins available. I use Mrs. Wage's Lite Home Jell, but there are others. It turns out just as well, and is diabetic-friendly. I'm sure any berry could be used instead of blackberries. Another possibility is to use one-half chopped peaches and one-half blackberries for a twist on classic jam.