I usually roast berries at 425F for about 15 minutes but think a longer roast at a lower temperature might do a better job of concentrating the flavors.
I enjoy salads, so I'll usually throw together a quick salad with avocado, organic salad leaves, a few berries, and some protein (e.g., leftover roast chicken, poached eggs, or smoked salmon, canned tuna or sardines).