My wife has been feeling very, very stressed this week. So I plan to leave work early one day, get two bouquets of flowers, clean up our room, clean up our bathroom and tub, make the bed and get dinner (that I will pick up from an Italian restaurant) ready. I will also get one of her favorite desserts. When she gets home, I will have dinner on the table ready for her.
After dinner, I will slip away to draw her a bubble bath complete with flowers, candles, some nice chilled chardonnay and her favorite magazine. I'll invite her to relax in the tub while I finish cleaning and take care of the children.
Since I like to do two part surprises, when she's done with the bath, the next part of the evening will be like normal until the kids go to bed.
When she's putting our baby down for the night, I'll sneak into our room and light some more candles, start some mild incense burning and – here's the cool part: cut some more flowers off the stems (so each stem is about 1/2 inch long) and lay them in a semi-circle around where her head will be on the bed.
Then I will invite her into the room for a sensual touch massage – no obligation! In fact, after it is done, I plan to leave the room so she can get ready for bed or get dressed and come out to snuggle on the couch – her choice. 
(Last time I did this kind of thing, she didn't let me leave the room.)
You want to Ignite Your Wife's Passion? Do no-obligation things like this every month or so for a few months. Her passion will be hot, hot, hot!