I have many rose bushes in my NW garden - one of the most remarkable is "Hot Cocoa."  The buds are a dark pinky violet, as they begin to open they turn to orange and then a rusty tone. With the recent hot weather the roses are not lasting as long as usual.  I picked these yesterday and they were turning color and drooping as quickly as I was painting them.  It's parents are Playboy and Easy Living - this particular bush is between the two.  Over the years I often see roses take on the characters of other roses beside them, a white becoming pink, etc.  One of the things I love about gardening!