...what ever you like that he gives you. I know some ladies aren't into flowers.
My DH is late from work. If he's late, he's usually buying me flowers, I'm out now. He doesn't let me go more than a few days without them. What's even better, he found a florist who is really reasonable and the place isn't too foo-foo for DH so he likes going there.
(If he's not buying me flowers, chances is he's getting himself some chocolate from Target;) LOL