A rose is a plant with sharp thorns on the stems. If you find "a rose among the thorns," you find a soft flower among the sharp thorns. The term can be used to mean anything nice found among not-so-nice things. You might say that someone is "a rose among thorns" if everyone around them is either unpleasant or incompetent.
The expression "garden of roses" means that everything is going exceptionally well for someone.
a thorn among the roses
You might be thinking of the phrase "a bed of roses." That means a cushy life or easy situation. See the link for more.
An example would be when someone is complaining about something minor that has occurred. You might say "You can't always have a bed of roses, you know" to remind them that life's not always going to be grand.
Among the Roses - 1910 was released on: USA: 15 August 1910
Monet painted House Among the Roses between 1917 and 1919.
The cast of Among the Roses - 1910 includes: King Baggot Florence Lawrence
Love Among the Roses - 1910 was released on: USA: 9 May 1910
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The meaning of 11 red roses: the color of roses; the number of roses each has got their meaning. Do you know that 11 roses represent "You are my treasured one; the one I love most in my life" whereas 15 roses represent "I am truly sorry, please forgive me"? Now isn't that a total twist of the meaning for the roses you gave? What had meant to be a message of love has just turned into a message of apology; implying you was guilty of something?
LITERALLY it means either "I will plant some roses for you" or "I will make a bed for you out of some roses."
Usually it means that someone LOVE YOU! Hehe! =)