From - http://www.proflowers.com/flowerguide/rosemeanings/pinkrose-meanings.aspx - This flower borrowed from Kasi's bouquet
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Pink roses have a rich history that comes with being one of the longest existing roses known to us - in fact, pink roses have even been depicted in some of the earliest known pieces of art. When roses first began to be cultivated, the majority of them existed in various shades of pink, from the palest pink to the deepest crimson. Prior to that, pink roses were the dominant species among wild roses, and were likely among the earliest roses to evolve.
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In time, discoveries of new rose species and the development of modern hybridization techniques would introduce many new colors of roses. Also introduced at this time were roses with the ability to bloom repeatedly throughout the year. This was a significant development, as earlier garden roses would typically only bloom once a year. As more colors and types of roses entered the palette, each began to take on their own meanings. So too, did the meaning of the pink rose become more refined.
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Above all, roses are a symbol for love and gratitude. As the pink rose was the most prevalent among the old garden roses, it was most strongly associated with these sentiments. While different roses may have more specific meanings, these are still the underlying message of any color rose. Pink roses also now carry a connotation of grace and elegance, as well as sweetness and poetic romance. Different shades of pink also carry their own significance. Dark pink roses are symbolic of gratitude and appreciation, and are a traditional way to send a message of thanks. Light pink roses are associated with gentleness and admiration, and can also be used as an expression of sympathy.
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With the many ways in which they can be used to express a range of meanings, pink roses continue to maintain their popularity. The beautiful appearance and fragrance so strongly associated with roses in general, as well as their symbolic importance, can be traced back to the pink rose. While much has changed over the years, pink roses have consistently held their place of prominence in the world of flowers. Today, pink roses enjoy their own unique position representing elegance and refinement, as well as communicating thanks and admiration. The recipient of an arrangement of pink roses is sure to feel appreciated and special.