>>7020637Risotto is best when it has minimal added ingredients, the rice should be the star of the dish. That being said just pine nuts and mushrooms would work really well in it, maybe some fresh parsley or basil if you have it.
Protip: toast the pine nuts in a little bit of olive oil and mix them in when you're doing the parmesan. And don't let the mushrooms cook in the rice, do them separately and spoon on top of the rice so they don't turn to mush.