My favourite plant/flower is the Hydrangea. I have a large one in the back yard and another in the front garden. The one in the front is supposed to be blue but I don't think the soil is acidic enough, so it tends to turn a purplish colour.
My second fave is the calla lily. My bridesmaids and I carried them in my wedding. They only had one each, though, because they're expensive here.
My favorites vary a bit, but I loooove roses. I'm picky about what I grow, though, because I don't spray my garden and I don't like fussy roses LOL. So, that leaves pretty much floribunda and climbers in my garden.