Talking about it is probably the easiest way. Watch a tasteful sex scene in a movie or two, and have that spark a conversation about what you'd like to try in the bedroom. Perhaps you or he (or both) have a fantasy you'd like to act out, or a position you've always wanted to try but never been bold enough? Here's your chance. One of my exes and I used to take turns pretending we were asleep, and the other would then "confess their desire" to the sleeping one. Takes some of the pressure off a confession like that.
Another good way to spark your sex life is to do something non-sexual that you've never done before together. Take a fencing class, or take up pottery together. You'll be amazed what a difference it makes in your relationship, which will then translate into the bedroom.
Best of luck.
Gangway, girls: I'll show you trouble.