I used to not be a big fan of roses -- but with over a hundred species and thousands of cultivars, I've definitely found some I love!
Yes and their smell is very distinctive. 
They have got to be one of the most popular ingredients in perfumes -- and they have a cultural significance in many societies, too.
I personally don't like rose smelling perfumes but a red rose is considered a symbol of love.
The Red Rose of Lancashire also served as a heraldic symbol and badge of Henry IV of England...just one of many times the rose has served as symbol!
Yes they come in various colors like yellow, orange, white and pink.
Ooooh, and I love how the colors come with meaning -- I love color psychology, and how the study of different hues can appeal to or determine human behavior.