Spread eagle ties are classic, sexy, and easy to do. Nothing says "vulnerable and helpless" quite like a spread eagle. Hogtying, while a bit more involved, can be a lot of fun too. If you use rope at all, a simple chest harness can be used as an anchor for a variety of other ties (e.g. thighs/knees to chest). And tying her wrists together behind her back can be pretty great too, whether she's standing, on her knees, or bent over. There's a lot more beyond that, but those are some of my favorites