I saw a card similar to this on a Facebook group that I belong to. It used a non-Stampin’ Up! (is there even such a thing?) flower stamp and greeting. It used different colors too but the concept was the same.
I first stamped the sentiment from Perfect Pennants on the Whisper White card stock. Then I stamped the flower and stem from Flower Patch and cut them out using the Flower Fair Framelits. I lined them up and stamped the greeting over them on a separate piece of paper. Then all I had to do was line up the greetings. Here is a close up: