I wish my ex was the sort of girl who suggested toys. I wanted her to use one, so I ordered it online and suggested we try it. I might have gone too fancy for the first one (but that was after receiving advice from a female friend of hers who was obviously much hornier).
We ended up getting another pretty plain vibrator which she preferred. Used it on her clit, not inside her. We then progressed to a we-vibe which she loved and the vibrating cock rings. Once your wife gets comfortable with them, she will probably want to experiment more.