I suppose so, but they have a unique and more delicate flavor, where chocolate may not really improve the taste, or might not give it the same results as red raspberries. Instead, you could always make a nice seedless blackberry preserve, jam, or jelly.

It would have been nice to post this question in the same thread as the original raspberry chocolate thread.. Every new thread posted pushes off the oldest ones, and some are invaluable unless they somehow are found, and brought back up before heading to the Twilight Zone of no return.