There aren’t a lot of regulations covering pesticides in cut flowers so usually they’re coated in poison. For that reason as well as others already given, I’d prefer something living and planted in a pot. Maybe a peace lily which is very pretty and difficult to kill.
Sunflowers.
I like potted plants–they don’t even have to flower! And any flower that smells good is okay, too!
anything you’ve picked yourself (even from the side of the road or from the neighbors garden after dark) especially Lilly of the Valley.
Aaaah. Purple Tiger Roses surrounded by lavender hydrangeas.
Mine were yellow roses and purple irises. And yes, you husband getting you your wedding flowers is very romantic. I’m guessing mine would have to look at pictures. He probably DOES recall that there were flowers.
lilies and orchids, in white, deep red, rust, and maybe a touch of purple
Oh, and I actively dislke carnations. They feel sort of cold and distant, somehow, and cliche. (No offense to the carnation devotees out there.)
All this talk of tulips and roses reminds me of this riddle:
What is better than roses on your piano?
Tulips on your organ.
Thank you, don’t forget to tip your waiter.
Potted. Probably also ‘useful’ – an herb, something that produces something I want.
My inside-the-house plants are an aloe, a Cabernet grapevine, and a jasmine plant. And a tropical water lily I think I’ve finally killed and need to think about replacing, alas.
I’m considering getting a vanilla orchid.
A big ass Christmas tree.
You drove out to the place where they sell them, you picked a chic one with scenty silvery perky branches, you hauled it in, picked a spot and put whatever stood there first in the shed, without breaking it. Then you put it in a bucket with enough water to keep it scenty, silvery, and perky, but not with so much water I will get stains on the floor later. And then you vacuumed all the needles off the floor and off yourself and you scrubbed all the mud from the hallway floor.
And now I get to decorate it.
:: smooch::
Potted is the best for me as well. Preferably bought at the farmers’ market and grown locally.
After that, something cut from the farmers’ market that was grown locally, so I’m not thinking of hot houses in Columbia and Kenya and places like that. I’d be considering the environmental impact of those hot houses, and the pesticides on the people working there.
However, I can’t say I’d turn up my nose at something more conventional from a “normal” florist. I used to love stargazer lilies, until they were the plant of the Bio II labs while I was getting my MS. Now I can’t stand the scent. I just think of freshmen learning about plant sex.
For conventional, probably lightly scented lilies or pale roses or something like that. Gladiolas are very nice as well.
I suspect I’m not the exact sort of respondent you’re looking for. On the whole let me suggest bright colors. That’s what gets me. Bright, something that draws the eye and makes me smile. Scent is important too, but brightly colored is (for me) more important.
Roses, daisies, sunflowers, and blue irises are my favorites.
But I love 'em all!
Except for stargazer lilies.
See, when I was getting married, the rabbi told us that we absolutely couldn’t have stargazer lilies. She was literally deathly allergic to them. We weren’t planning to have them…but yeesh! Now every time I see a stargazer lily–even in a photo–I immediately think of a dead rabbi on my wedding day! :eek:
Yellow roses. I carried them in my wedding and I think they’re so beautiful. I don’t care what the “experts” say about them not being romantic. They’re my favorite, and I find it VERY romantic when my DH remembers that and sends me a big bouquet!
Daisies, and spider mums, any color. Daisies are nice and fresh and simple, and spider mums are a little crazy, just like me. 
Daffodils. Preferably the all-yellow kind, not the two-tone varieties.
And if for some reason I was in an appropriate part of Texas at the right time of year, bluebonnets.
I recently got some spider mums and they lasted for over two weeks.
Lilacs. Roses. Bird-of-Paradise.
Flowers? Meh. If you want me to rip our clothes off, you’re going to have to be more creative than that.
If you’re willing to be patient, you might bring me something in the cannabis family… 
Bring chips!
It really depends on her type. Is she into the outdoors, a perfect date is a picnic, she’s love to go on vacation to a house on a lake? She’s probably more of a daisies type. Is she a night-out-at-the-theater girl, into dressing up and having an elegant evening? Probably orchids and roses. Is she funky, artsy, and unpredictable? Those spider mums, or an interesting potted plant.