Chocolately and coffee flavors can go great with mead or red wine. Some great juices that compliment these flavors nicely are cherry, pomegranate, and red grape!
To add a chocolately feel to your wine, dissolve cacao powder in hot water. Let cool, and then add to your wine to taste. Add the cacao powder at any point during cold-crashing.
If you have cacao nibs, you can also add whole nibs to your wine during cold-crashing. Keep them in for 3 to 4 days, and then remove them.
To add a coffee flavor to your wine, pick out your favorite cold brew. Then, add it to your wine to taste during cold-crashing.