http://i182.photobucket.com/albums/x...07/misc001.jpg

Please can anyone help me to identify this flower? I was given it about 5 years ago and so I presume it is a perennial. When I went to Beamish Museum about a month ago I saw the same flower but it was a lovely sky blue colour. I would like to buy a plant or some seeds but I don't know the name of it. I would be so grateful if anyone could identify it for me.