We grill a lot of steak and normally, I just like the flavors of whatever I happen to marinate them with. This past Saturday, I worked up a little sauce I use every now and then to pour over them when I get them off the grill. I only do this with filets but I think it would be fine on ribeye as well. Simple, but something different.
Got a frying pan and mixed:
Red wine
Portabella mushrooms
Sour cream
Garlic
When you've got that reduced down, at the very end, add blue cheese crumbles. Immediately pour over the steak.