To say that everyone is different - is to state the obvious. I assume since you're married that you have some idea of what used to turn on your guy - perhaps that's the place to start. What has he wanted to try that you have resisted - obvious examples are more oral - or some anal exploration.
Would he love to see you shaved smooth - decked out in a tiny LolaLuna micro-g-string link
or maybe something sexy like Sylvie Monthule intimate jewelry link
Off course there are tons of vibes and dildos out there - if he isn't intimidated by that kind of play. Some people think of these toys as solo instruments of pleasure - my wife and I always use them together. I can use some toys to bring her to her first orgasm - then join in the fun to bring her #2 - or more, while working up to my own release.
I'm a very visual kind of guy - so I go for the eye-candy. But I must say that the most erotic thing about the shaving, lingerie or jewelry - isn't the actual item - it's that fact that it means enough to her that she would put the effort into thinking of something to please me - then following through.
Think of it - it's not the flowers per se - it's that he put forth the effort to get something nice for you. It's pretty much the same context - except much more direct - more sexual - men are not so subtle!
One last observation - many guys by this time in a marriage are are tired of having to always pressure & negotiate for sex. If you take the initiative he won't feel like your doing it just because he pressured you. There's nothing sexier than a woman who WANTS to have SEX!