Help me figure out what do do with these peppers...

I don't like eating anything too hot, but my cousin, who does, makes a sauce from chillis.  I think you could use either of the first two types you posted. She fries onions and a tomato, adds a cut up eggplant,then adds the chillis. She puts some cumin, salt and, if you want, a little tomato paste. After everything is cooked, put it in a blender. She usually serves it with rice or a bread that she makes that Ethiopians call Injera. Sometimes she makes it brown and sometimes like the one in the picture below. There are different recipes online that you can find to make it if you are so inclined, but if not, you could use pita bread instead perhaps.